Error when trying to add AD group to Gateway Access

I’ve encountered this issue once before after upgrading Windows Admin Center. It seems that the error  happens because certain components, like System.DirectoryServices.Protocols, aren't fully compatible or supported in the latest version on Server 2022. To try to resolve it, I recommend you checking if all related Windows features and roles for AD and remote access are properly installed. Sometimes, a fresh install or repair of the WAC components may help resolve compatibility issues. Also you should verify that all relevant updates and patches for both the OS and WAC are fully applied. If the issue persists, you can also manage the group memberships directly through Active Directory or PowerShell, at least until a fix is available.

Hope it helps!