If you are trying to list thousands of group members, you may come across a size limit for this request was exceed the issue with Get-AdGroupMember. By default, the limit is 5000 objects. This limit is from Active Directory Web Service and applies to three cmdlets Get-ADGroupMember, Get-ADPrincipalGroupMembership, and Get-ADAccountAuthorizationGroup. You can modify it in the config file. You will have to make sure to update the config file on each DC. On Domain controller, open file at location C:\\Windows\\ADWS\\Microsoft.ActiveDirectory.WebServices.exe.config and look for appSettings tag, add below tag Save the config file and restart ADWS service on DC. Repeat the above step on each DC.