Hi @Ric Tugade ,
Thank you for posting to Microsoft Community.
Based on your description, I know you got an error when you migrated from Google to M365.
We do not support sending you emails to resolve issues. It’s a better way we communicate directly in the thread.
The reason why the issue occurred could be the Google Calendar API is disabled in the Google Workspace account that hosts the mailboxes.
You could follow the steps below to fix the issue.
- Enable the Google Calendar API in the Google Workspace account that hosts the mailboxes.
- Wait 5–10 minutes for the API to become fully enabled, and then resume the batch migration.
For more information, you could refer to GooglePermanentWebException error in a Google Workspace migration - Exchange | Microsoft Learn.
If my answer is helpful to you, please mark it as the answer so that other users can refer to it. Thank you for your support and understanding.