Login from AD-Subdomain?

Product: PowerShell Universal
Version: 4.2.15

We use PowerShell Universal for our ad-users, authenticated via ActiveDirectory-Groups.
Recently we added a user from one of our AD-Subdomains to one of the groups, but he is not able to log on. (Bad username or password)

What needs to be in place, to enable logon from AD-Subdomain?

Kindest regards,

We fixed it. First we get the user from the global catalog, and with this information we are able to see the correct DomainController to get Groupmembership for the subdomainuser.