Your migration failed checking Source credentials. Cannot connect to Drive API: Google.Apis.Requests.RequestError Invalid Credentials  Errors [ Message[Invalid Credentials] Location[Authoriza...
Ensure the user in question is not suspended in GSuite and that they are able to access their Google Drive
Check to see if the Admin address and user email address are entered correctly in MigrationWiz. If the information is incorrect of there was a typo, please correct and attempt the migration again.
Ensure that you are using the Full Scopes instead of the Read-Only scopes mentioned in this guide: Enable access to G Suite (IMAP) using OAuth 2.0