Google Workspace connecting error through App Connector (in MDCA)

Microsoft
Hi experts,
Cx tried to connect Google Workspace through App Connector in MDCA. Cx confirmed that he followed every steps perfectly to configure GG Workspace in this doc https://learn.microsoft.com/en-us/defender-cloud-apps/protect-google-workspace#configure-google-work.... But after connecting 'Google Workspace' Cx have recieved the following error message:
 
Get Files: GoogleJsonResponseException: 401 Unauthorized
{
'code' : 401,
'errors' : [ {
'domain' : 'global',
'location' : 'Authorization',
'locationType' : 'header',
'message' : 'Active session is invalid. Error code: 4',
'reason' : 'authError'
} ],
'message' : 'The caller does not have permission',
'status' : 'PERMISSION_DENIED'
}
Get Events: Success
Get Users: Success
 
The cx guesses the problem is that he is disabling the 'Drive and Docs' in Google Workspace, but he can't find any documantation that supports this theory.
 
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Kindly suggest me the approach for this case.
 
Many thanks!
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