• Quickbooks Error Code (120): Authorization Failure: AuthorizationFailure: Unknown Error during Authentication, statusCode 500

  • Duplicate Document Number Error AuthorizationFailure : XXX Accountant user was deleted while still connected to the company.


  • Syngency Manage

  • Quickbooks Online

Additional Information:

  • For a full list of Quickbooks Error Codes click here.

  • To find Quickbooks errors click here.


This occurs whenever the user who initially set up the Syngency to Quickbooks Online sync is disabled in Quickbooks.


  • Disconnect the sync by Revoking, then set up the sync with an enabled user.

  • If this does not resolve the issue, contact Syngency Support

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