Is GAT+ failing to run? Check these options in your Admin Console

Click the Apps Launcher on the top right corner of your Chrome session and click on the Admin Icon:

Enter the Apps section:

Then click on the Google Workspace Marketplace apps.

Click on the GAT+ app.

You will need to click on the text Grant access and the status should be Granted and make sure GAT+ is Enabled for all organizational units.

To enable Classroom auditing

In the Google Apps Admin console, select Apps, Google Workspace, Settings for Classroom and Data Access. Make sure the option Users can authorize apps to access their Google Classroom data is enabled.