one brokerserver (windows 2022) With all services installed and two Collections always connect to same collection

Question

I have a RDM server setup

1 brokerserver

Collection1 -> collection-1-users -> user1

       RDMserver1

       RDMserver2

Collection2 -> collection-2-users -> user2

      RDMserver3

When i logon to the brokerserver I always logon to Collection1 even with user2 who is not a meber of the collection-1-users but only a member of collection-2-users.

On the servers 1 and 2 I added the collectionusers-1-group to the local group "Remote desktop users"

and on the RDMserver3 I added the collectionusers-2-group to the local group "Remote desktop users"

What am i missing to make user2 logon to collection2