Set up the Azure application for an advanced migration

1. As an administrator, sign in to your Azure portal.
2. Click Cloud ShellPowershell.
3. If prompted, create a storage account and accept the default settings.
4. To create the application, enter the following command and then click Enter:

   Install-Module Microsoft.Graph -Scope CurrentUser

5. If you see a prompt to install from an Untrusted Repository, enter Y and then click Enter.
6. Copy the following code block, paste it into PowerShell, and click Enter.

       <#
       .SYNOPSIS
       Automates the creation of a Single-Tenant Entra ID App for Workspace Migration.
       Strictly forces account selection and verifies specific Admin roles.
       #>
   
       # Check if the module is missing
       if (-not (Get-Module -ListAvailable -Name Microsoft.Graph.Authentication)) {
       Write-Host "Microsoft Graph module is NOT installed." -ForegroundColor Yellow
       $UserResponse = Read-Host "Would you like to try installing Microsoft Graph? (Y/N)"
   
       if ($UserResponse -ieq "Y") {
           try {
               # Use only native cmdlets, no .NET property setting
               Install-Module -Name Microsoft.Graph -Scope CurrentUser -Force -AllowClobber
               Write-Host "Installation complete!" -ForegroundColor Green
           }
           catch {
               Write-Error "Policy is blocking installation. Please contact IT to install Microsoft.Graph module."
               Read-Host "Press Enter to exit"; exit
           }
       }
       else {
           exit
       }
       } else {
       Write-Host "Microsoft Graph modules detected. Proceeding..." -ForegroundColor Green
       }
   
       # --- STEP 0: THE "DEEP" LOGOUT ---
       Write-Host "Forcing session cleanup..." -ForegroundColor Gray
       Disconnect-MgGraph -ErrorAction SilentlyContinue
   
       # Force clear the local token cache folder if it exists
       $CachePath = "$env:USERPROFILE\.mg"
       if (Test-Path $CachePath) {
       try { Remove-Item $CachePath -Recurse -Force -ErrorAction SilentlyContinue } catch {}
       }
   
       Write-Host "Opening Microsoft Login... (Please select the correct account)" -ForegroundColor Cyan
   
       $RequiredScopes = @(
       "Application.ReadWrite.All", 
       "AppRoleAssignment.ReadWrite.All", 
       "Directory.Read.All", 
       "RoleManagement.Read.Directory"
       )
   
       try {
       # In v2, -ContextScope Process is the most reliable way to force account selection
       # and prevent the session from saving to the machine permanently.
       Connect-MgGraph -Scopes $RequiredScopes -ContextScope Process
   
        $Context = Get-MgContext
       if ($null -eq $Context) { throw "Login was cancelled or failed." }
   
       $UserPrincipal = $Context.Account
       Write-Host "Logged in as: $UserPrincipal" -ForegroundColor Green
   
       # --- ROLE VALIDATION ---
       Write-Host "Verifying Directory Roles..." -ForegroundColor Gray
       $UserRoles = Get-MgUserMemberOf -UserId $Context.Account -All | Where-Object { $_.AdditionalProperties.displayName -ne $null }
       
       $Authorized = $false
       $RequiredRoles = @("Global Administrator", "Privileged Role Administrator")
   
       foreach ($role in $UserRoles) {
           $roleName = $role.AdditionalProperties.displayName
           if ($roleName -in $RequiredRoles) {
               $Authorized = $true
               Write-Host "Access Granted: $roleName" -ForegroundColor Green
               break
           }
       }
   
       if (-not $Authorized) {
           Write-Host "`nCRITICAL ERROR: Insufficient Privileges." -ForegroundColor Red
   
        Write-Host "Account must be 'Global Administrator' or 'Privileged Role Administrator'." -ForegroundColor Yellow
           Disconnect-MgGraph
           Read-Host "`nPress Enter to exit"; exit
       }
   
       } catch {
       Write-Error "Login failed: $_"
       Read-Host "Press Enter to exit"; exit
       }
   
       # --- USER INPUT ---
       Write-Host "`n--- APPLICATION SETUP ---" -ForegroundColor Cyan
       $InputName = Read-Host "Enter the name for your new Entra ID Application (Default: Workspace Migration App)"
       $AppName = if ([string]::IsNullOrWhiteSpace($InputName)) { "Workspace Migration App" } else { $InputName }
   
       # --- CONFIGURATION ---
       $PermissionMap = @{
       "calendar.read"  = "Calendars.Read"     
       "mail.read"      = "Mail.Read"
       "contacts.read"  = "Contacts.Read"
       "directory.read" = "Directory.Read.All"
       }
   
       $TenantId = $Context.TenantId
       $GraphAppId = "00000003-0000-0000-c000-000000000000"
   
       try {
       # --- STEP 1: REGISTER APPLICATION ---
       Write-Host "Creating Application: $AppName..." -ForegroundColor Cyan
       $Application = New-MgApplication -BodyParameter @{
           displayName = $AppName
           signInAudience = "AzureADMyOrg"
       }
       
       # --- STEP 2: PREPARE SERVICE PRINCIPAL ---
       $NewServicePrincipal = New-MgServicePrincipal -BodyParameter @{ appId = $Application.AppId }
   
       Write-Host "Waiting 10 seconds for replication..." -ForegroundColor DarkGray
       Start-Sleep -Seconds 10
   
       # --- STEP 3: CONFIGURE & GRANT PERMISSIONS ---
       Write-Host "Configuring API Permissions & Granting Admin Consent..." -ForegroundColor Cyan
       $GraphSP = Get-MgServicePrincipal -Filter "AppId eq '$GraphAppId'" | Select-Object -First 1
       
       $ResourceAccessList = @()
   
       foreach ($key in $PermissionMap.Keys) {
           $RealRoleName = $PermissionMap[$key]
           $Role = $GraphSP.AppRoles | Where-Object { $_.Value -eq $RealRoleName }
   
           if ($Role) {
               $ResourceAccessList += @{ id = $Role.Id; type = "Role" }
   
               New-MgServicePrincipalAppRoleAssignment -ServicePrincipalId $NewServicePrincipal.Id -BodyParameter @{
                   principalId = $NewServicePrincipal.Id
                   resourceId  = $GraphSP.Id
                   appRoleId   = $Role.Id
               } | Out-Null
               Write-Host " - Granted: $RealRoleName" -ForegroundColor Gray
           }
       }
   
       Update-MgApplication -ApplicationId $Application.Id -RequiredResourceAccess @(@{
           resourceAppId  = $GraphAppId
           resourceAccess = $ResourceAccessList
       })
   
       # --- STEP 4: CREATE CLIENT SECRET ---
       Write-Host "Generating Client Secret..." -ForegroundColor Cyan
       $ExpiryDate = (Get-Date).AddYears(2).ToUniversalTime().ToString("yyyy-MM-ddTHH:mm:ssZ")
       $PasswordCred = Add-MgApplicationPassword -ApplicationId $Application.Id -BodyParameter @{
           passwordCredential = @{
               displayName = "MigrationToolSecret"
               endDateTime = $ExpiryDate
           }
       }
   
       # --- OUTPUT ---
       Write-Host "`n-------------------------------------------------------" -ForegroundColor Yellow
       Write-Host "        SETUP COMPLETE - SAVE THESE DETAILS" -ForegroundColor Yellow
       Write-Host "-------------------------------------------------------" -ForegroundColor Yellow
       Write-Host "Application Name        : $AppName"
       Write-Host "Application (Client) ID : $($Application.AppId)"
       Write-Host "Client Secret Value     : $($PasswordCred.SecretText)"
       Write-Host "Directory (Tenant) ID   : $TenantId"
       Write-Warning "IMPORTANT: Copy the Client Secret Value immediately."
   
       }
       catch {
       Write-Error "Operation failed: $_"
       }
   
       # --- FINAL DISCONNECT ---
       Disconnect-MgGraph
       Read-Host "`nPress Enter to close this window"
       

7. Note the following credentials and store them securely. If the credentials are leaked, hackers could access all of your Exchange Online data.
   • Client secret
   • Application (client) ID
   • Directory (tenant) ID

1. In Windows, create a new plain text file and name it migration_app_creator.ps1.
2. Copy the following code block, paste it into the new file, and click Run with Powershell.

    <#
    .SYNOPSIS
    Automates the creation of a Single-Tenant Entra ID App for Workspace Migration.
    Strictly forces account selection and verifies specific Admin roles.
    #>

    # Check if the module is missing
    if (-not (Get-Module -ListAvailable -Name Microsoft.Graph.Authentication)) {
    Write-Host "Microsoft Graph module is NOT installed." -ForegroundColor Yellow
    $UserResponse = Read-Host "Would you like to try installing Microsoft Graph? (Y/N)"

    if ($UserResponse -ieq "Y") {
        try {
            # Use only native cmdlets, no .NET property setting
            Install-Module -Name Microsoft.Graph -Scope CurrentUser -Force -AllowClobber
            Write-Host "Installation complete!" -ForegroundColor Green
        }
        catch {
            Write-Error "Policy is blocking installation. Please contact IT to install Microsoft.Graph module."
            Read-Host "Press Enter to exit"; exit
        }
    }
    else {
        exit
    }
    } else {
    Write-Host "Microsoft Graph modules detected. Proceeding..." -ForegroundColor Green
    }

    # --- STEP 0: THE "DEEP" LOGOUT ---
    Write-Host "Forcing session cleanup..." -ForegroundColor Gray
    Disconnect-MgGraph -ErrorAction SilentlyContinue

    # Force clear the local token cache folder if it exists
    $CachePath = "$env:USERPROFILE\.mg"
    if (Test-Path $CachePath) {
    try { Remove-Item $CachePath -Recurse -Force -ErrorAction SilentlyContinue } catch {}
    }

    Write-Host "Opening Microsoft Login... (Please select the correct account)" -ForegroundColor Cyan

    $RequiredScopes = @(
    "Application.ReadWrite.All", 
    "AppRoleAssignment.ReadWrite.All", 
    "Directory.Read.All", 
    "RoleManagement.Read.Directory"
    )

    try {
    # In v2, -ContextScope Process is the most reliable way to force account selection
    # and prevent the session from saving to the machine permanently.
    Connect-MgGraph -Scopes $RequiredScopes -ContextScope Process

     $Context = Get-MgContext
    if ($null -eq $Context) { throw "Login was cancelled or failed." }

    $UserPrincipal = $Context.Account
    Write-Host "Logged in as: $UserPrincipal" -ForegroundColor Green

    # --- ROLE VALIDATION ---
    Write-Host "Verifying Directory Roles..." -ForegroundColor Gray
    $UserRoles = Get-MgUserMemberOf -UserId $Context.Account -All | Where-Object { $_.AdditionalProperties.displayName -ne $null }
    
    $Authorized = $false
    $RequiredRoles = @("Global Administrator", "Privileged Role Administrator")

    foreach ($role in $UserRoles) {
        $roleName = $role.AdditionalProperties.displayName
        if ($roleName -in $RequiredRoles) {
            $Authorized = $true
            Write-Host "Access Granted: $roleName" -ForegroundColor Green
            break
        }
    }

    if (-not $Authorized) {
        Write-Host "`nCRITICAL ERROR: Insufficient Privileges." -ForegroundColor Red

     Write-Host "Account must be 'Global Administrator' or 'Privileged Role Administrator'." -ForegroundColor Yellow
        Disconnect-MgGraph
        Read-Host "`nPress Enter to exit"; exit
    }

    } catch {
    Write-Error "Login failed: $_"
    Read-Host "Press Enter to exit"; exit
    }

    # --- USER INPUT ---
    Write-Host "`n--- APPLICATION SETUP ---" -ForegroundColor Cyan
    $InputName = Read-Host "Enter the name for your new Entra ID Application (Default: Workspace Migration App)"
    $AppName = if ([string]::IsNullOrWhiteSpace($InputName)) { "Workspace Migration App" } else { $InputName }

    # --- CONFIGURATION ---
    $PermissionMap = @{
    "calendar.read"  = "Calendars.Read"     
    "mail.read"      = "Mail.Read"
    "contacts.read"  = "Contacts.Read"
    "directory.read" = "Directory.Read.All"
    }

    $TenantId = $Context.TenantId
    $GraphAppId = "00000003-0000-0000-c000-000000000000"

    try {
    # --- STEP 1: REGISTER APPLICATION ---
    Write-Host "Creating Application: $AppName..." -ForegroundColor Cyan
    $Application = New-MgApplication -BodyParameter @{
        displayName = $AppName
        signInAudience = "AzureADMyOrg"
    }
    
    # --- STEP 2: PREPARE SERVICE PRINCIPAL ---
    $NewServicePrincipal = New-MgServicePrincipal -BodyParameter @{ appId = $Application.AppId }

    Write-Host "Waiting 10 seconds for replication..." -ForegroundColor DarkGray
    Start-Sleep -Seconds 10

    # --- STEP 3: CONFIGURE & GRANT PERMISSIONS ---
    Write-Host "Configuring API Permissions & Granting Admin Consent..." -ForegroundColor Cyan
    $GraphSP = Get-MgServicePrincipal -Filter "AppId eq '$GraphAppId'" | Select-Object -First 1
    
    $ResourceAccessList = @()

    foreach ($key in $PermissionMap.Keys) {
        $RealRoleName = $PermissionMap[$key]
        $Role = $GraphSP.AppRoles | Where-Object { $_.Value -eq $RealRoleName }

        if ($Role) {
            $ResourceAccessList += @{ id = $Role.Id; type = "Role" }

            New-MgServicePrincipalAppRoleAssignment -ServicePrincipalId $NewServicePrincipal.Id -BodyParameter @{
                principalId = $NewServicePrincipal.Id
                resourceId  = $GraphSP.Id
                appRoleId   = $Role.Id
            } | Out-Null
            Write-Host " - Granted: $RealRoleName" -ForegroundColor Gray
        }
    }

    Update-MgApplication -ApplicationId $Application.Id -RequiredResourceAccess @(@{
        resourceAppId  = $GraphAppId
        resourceAccess = $ResourceAccessList
    })

    # --- STEP 4: CREATE CLIENT SECRET ---
    Write-Host "Generating Client Secret..." -ForegroundColor Cyan
    $ExpiryDate = (Get-Date).AddYears(2).ToUniversalTime().ToString("yyyy-MM-ddTHH:mm:ssZ")
    $PasswordCred = Add-MgApplicationPassword -ApplicationId $Application.Id -BodyParameter @{
        passwordCredential = @{
            displayName = "MigrationToolSecret"
            endDateTime = $ExpiryDate
        }
    }

    # --- OUTPUT ---
    Write-Host "`n-------------------------------------------------------" -ForegroundColor Yellow
    Write-Host "        SETUP COMPLETE - SAVE THESE DETAILS" -ForegroundColor Yellow
    Write-Host "-------------------------------------------------------" -ForegroundColor Yellow
    Write-Host "Application Name        : $AppName"
    Write-Host "Application (Client) ID : $($Application.AppId)"
    Write-Host "Client Secret Value     : $($PasswordCred.SecretText)"
    Write-Host "Directory (Tenant) ID   : $TenantId"
    Write-Warning "IMPORTANT: Copy the Client Secret Value immediately."

    }
    catch {
    Write-Error "Operation failed: $_"
    }

    # --- FINAL DISCONNECT ---
    Disconnect-MgGraph
    Read-Host "`nPress Enter to close this window"
    

For security reasons, we recommend that you register the new application as a single tenant.

1. As an administrator, sign in to your Azure portal.
2. In Azure Active Directory (Azure AD), go to App registrations.
3. Click New Registration and enter a name for your application (for example, Advanced migration app).
4. For Supported account types, click Accounts in this organizational directory only to create a single tenant application.
5. Click Register.

Choose one of the following options:

Option 1: Manually add permissions

1. On the side, for Manage, click API permissions.
2. Click Add a permissionMicrosoft APIsMicrosoft Graph.
3. For application permissions, select:
   • calendars.read
   • mail.read
   • contacts.read
   • Directory.read.all
4. Click Grant admin consent for your organization.

Option 2: Edit the application manifest

1. Open the application manifest.
2. Go to “resourceAccess” : [ ]and choose an option:
   • If “resourceAccess” : [ ] already has a value, add a comma and then paste the following code block.
   • If “resourceAccess” : [ ] doesn’t have a value, copy and paste the following code block.

   { "id": "089fe4d0-434a-44c5-8827-41ba8a0b17f5", "type": "Role" },

   { "id": "810c84a8-4a9e-49e6-bf7d-12d183f40d01", "type": "Role" },

   { "id": "7ab1d382-f21e-4acd-a863-ba3e13f7da61", "type": "Role" },

   { "id": "798ee544-9d2d-430c-a058-570e29e34338", "type": "Role" }

3. Click Grant admin consent for your organization.

1. On the side, for Manage, click Certificates & secretsNew client secret.
2. Enter a description, select an expiration period, and click Add.
3. Copy the Client secret value and store it securely. The value is displayed only once.

Important: Store the application credentials securely. If the credentials are leaked, hackers could access all of your Exchange data.

Click Overview and securely note the following credentials:

• Application (client) ID
• Directory (tenant) ID