Consider the following scenario:
You have created a new Group Policy Object (GPO). Right after you have created the GPO you attempt to change the Approval List for this GPO (not the Version Control container where the GPO resides). You receive an error message saying "Cannot set required approvals."
The issue is planned to be resolved in a future hotfix for the 5.11 release.
Deploy the GPO once before changing the Approval List for the GPO. It can be deployed without making any changes to the GPO.