I. During Free/Busy

Problem

Performing free/busy requests to Google failed with the error ‘Google.Apis.Requests.RequestError Invalid Credentials [401] Errors [ Message[Invalid Credentials] Location[Authorization – header] Reason[authError] Domain[global] ] ‘.

Cause

The login filled in the field Free/busy User Login is not valid

Resolution

Check if your user have:

  1. A valid account (no issue with password expired, or inactive account)
  2. A valid access to use G Suite Calendar

Cause

The login filled in the field Free/busy User Login is not valid

Resolution

Check if your user have:

  1. A valid account (no issue with password expired, or inactive account)
  2. A valid access to use G Suite Calendar

II. During File migration

Problem

Performing a G drive migration, you noticed the following error:¬† “Fatal Error : Google.Apis.Requests.RequestError Invalid Credentials [401] Errors [ Message[Invalid Credentials] Location[Authorization – header] Reason[authError] Domain[global]”.

Cause 1

The migrated user does not have a valid G Suite license.

Resolution 1

  1. Log into admin console https://admin.google.com/AdminHome, then choose Users.
  2. Click on the impacted user.

In the section License check if the license allow user to have a drive. For example, only Google Vault license assigned does not allow to have a drive.

Cause 2

The user does not have an access to Drive and Docs App.

Resolution 2

  1. Log into admin console https://admin.google.com/AdminHome, then choose Apps.
  2. Click on G Suite.


The Drive and Docs App should be activated for everyone or for organisation where the impacted user located: