Salesforce Field Service - "Update Permissions" Button Shows "Permission Set Up To Date" and reverts to "Update Permissions" button.

This issue occurs when a custom Permission Set in the org has the same API name as a standard Salesforce Field Service Permission Set. 

Steps to Resolve the Duplicate API Name Conflict

1. Identify the Problematic Permission:
     - Take note of the permission that is causing the issue. For example, "Field Service Integration."
2.  Navigate to Permission Sets:
     - Go to Setup > Permission Sets.
3. Check for Duplicate API Names:
     - Check if there exists a permission set with the same API name. For example, you might have a permission set named "Field Service Integration" and another named "Field Service Integration Test," but both have the same API name of sfdc_fieldservice.
4. Resolve the Duplicate API Name:
     - Modify the API name of the custom permission set or delete it if it isn't in use.
5. Update the Permission Set:
     - Go to App Launcher > Field Service Settings > Permission Sets.
     - Update the permission set that was causing the issue (e.g., "Field Service Integration"). The update should be successful.