You can change the admin account used to activate the backup task for Google Workspace. For this:
Sign in to your Google Workspace admin account.
In the CAB Management Portal, click Homepage in the sidebar menu.
The list of backup tasks opens.
Click the Google Workspace backup task.
The backup task page opens.
Click the connection status icon ( or ).
The authentication dialog opens.
In the authentication dialog, click Integrate With Google, and complete the authorization process.
Once you complete authorization, you will be redirected to the backup task page again.