AD error when add a user to an user group.

Cloud 24R1:

We get an error when we add an user to an user group in AD. Still the user is in IFS added to the user group. 

Steps taken:

create a new user in AD and sync to IFS → works great

create a new user group in AD and sync to IFS → works great

Add the user to user group in AD and sync to IFS → in IFS the user is added to the user group but in AD we get and error message:

StatusCode: InternalServerError Message: Processing of the HTTP request resulted in an exception. Please see the HTTP response returned by the 'Response' property of this exception for details. Web Response: {"schemas":["urn:ietf:params:scim:api:messages:2.0:Error"],"detail":"null","status":"500"}. This operation was retried 1 times. It will be retried again after this date: 2024-10-08T15:59:31.9082055Z UTC. 

Any idea what is causing the error and how we can resolve the error message? 

Any help is greatly appreciated!