Hello Sri_1,
Thank you for posting in Microsoft Community forum.
I can suggest some steps you can take to try to identify who has made changes to your Resource Authorization Policies.
First, you can check the event logs on your RD Gateway server. Look for events related to changes in user groups or Resource Authorization Policies. These events may provide information about who made the changes.
You can also check the security logs on your domain controller. Look for events related to changes in group membership. These events may provide information about who added or removed users from groups.
If you have auditing enabled on your RD Gateway server, you may be able to see who made changes to the Resource Authorization Policies by reviewing the audit logs.
I hope the information above is helpful.
If you have any question or concern, please feel free to let us know.
Best Regards,
Haijian Shan