Unable to restore a recently deleted user

You are unable to restore a user who was recently deleted.

• Admin console
• The same user address was used as alias in another domain that was removed from the Google Workspace account.

You cannot restore the user because the alias was used as a visitor account but cannot be deleted. Therefore, to delete the visitor account you will need to re-share a file to the same user and then this user will need to follow these steps: 

1. Sign in to your visitor session using the "Invitation to [Edit/Comment/View]" email from Google.
2. In the top right, click your initial.
3. Click Delete visitor session.
4. Click Send.
5. In your email inbox, open the verification code email.
6. Enter the verification code in the box provided and then click Next.
7. Click the checkbox and then click Delete. 

After deleting this visitor account you will be able to restore the recently deleted user.

For additional reference feel free to visit this Help Center article.

A user was deleted but is unable to restore it because it had a user alias with a secondary domain and this domain has been removed and added to another Workspace account.