To resolve the issue of being unable to change the group category of an Active Directory group:

1. Check that the domain controller of the domain you are attempting to modify the group on is operating normally.


2. Verify that the user you are using to perform the changes has sufficient permissions for the change to complete.


3. Confirm that any necessary prerequisites have been met to enable the change.


4. Ensure that there are no group policy objects (GPOs) that are preventing the change.