AAD DC Administrators Manage group membership button does not work

Hello @SolCo Admin
I understand that the "Manage group membership" button next to AAD DC Administrators is not functioning, and you're attempting to set up Entra Domain Services, but you're currently unable to add users to the group.

To enable Domain Services, ensure that you have both the Application Administrator and Groups Administrator roles assigned in your Microsoft Entra tenant.
If the issue still persists, try creating a Microsoft Entra group named AAD DC Administrators using the New-MgGroup cmdlet. Members added to this group will be granted the necessary permissions to perform administrative tasks on the managed domain.

PowerShellCopy

New-MgGroup -DisplayName "AAD DC Administrators"
-Description "Delegated group to administer Microsoft Entra Domain Services"
-SecurityEnabled:$true -MailEnabled:$false `
-MailNickName "AADDCAdministrators"

With the AAD DC Administrators group created, add a user to the group using the New-MgGroupMemberByRef cmdlet. You first get the AAD DC Administrators group object ID using the Get-MgGroup cmdlet, then the desired user's object ID using the Get-MgUser cmdlet.
For additional information please refer these documents: https://learn.microsoft.com/en-us/entra/identity/domain-services/tutorial-create-instance-advanced#configure-an-administrative-group
https://learn.microsoft.com/en-us/entra/identity/domain-services/template-create-instance#create-required-microsoft-entra-resources
If the issue still persists. Do let me know we are happy to assist you further.