Problem
For example John Doe is the primary user and his email is johndoe@domain.com, his email alias is a deleted user Jane Doe with an email address janedoe@domain.com
When sending a Calendar invitation to the primary user email (John Doe - johndoe@domain.com), the email alias user (Jane Doe) appears on the Guest List instead of the main user
Environment
Google Calendar on the web
Solution
Google Calendar has machine learning, if the user who invites John Doe frequently contacted or sent Jane Doe emails and invitations in the past, this might be the cause why when the user tries to reach John Doe, the suggestion would always have "Jane Doe" on the pop up and when the user presses enter, the invitation goes straight to the email alias.
As a workaround, the users on their organization can go to Google Contacts and delete Jane Doe from their contacts list.
As a workaround, the users on their organization can go to Google Contacts and delete Jane Doe from their contacts list.
Cause
The email alias was a previously deleted user and it exists on their organization's Google Contacts