Google Workspace to Exchange Online Mailbox Migration Recent Issue

Occasional Visitor

Hello,

 

Early last year we started a staged migration of mailboxes from the Google Workspace to Exchange Online as part of a company acquisition. We are using these instructions:

 

https://docs.microsoft.com/en-us/exchange/mailbox-migration/manually-configuring-gsuite-for-migratio...

 

This has worked since then but as of two weeks ago it stopped working. It started giving us the following message:

 

"Error: OAuthBadResponseInvalidGrantException: The call to https://www.googleapis.com/oauth2/v4/token returned with status code BadRequest: Bad Request Error response: invalid_grant Error description: Invalid email or User ID"

 

We have gone through the steps of recreating the Google project / service account and the 365 migration endpoint several times but we always come back to the same error.

 

I have logged with MS but after some troubleshooting they suggested we log a case with Google. Unfortunately, this new company does not have a support contract for Google so I'm a bit stuck.

Any one have any ideas as to what might be the problem?

 

Thanks,

Alastair

 

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