when you are not on the home page of the test server and you want to come to the forum, the url is forum.tsotesting2.com.
if we are connected to the test server, and we want to reach the forum, we are redirected to the classic home page to log in. However, the fact that we connect with these ubisoft identifiers should not lead to this type of situation.
Also the url should lead directly to the forum section for the test server without having to log in again since we are connected with these ubisoft identifiers.
I'm not sure if this would have made sense if the username was for the server you registered for, but to my knowledge, the ubisoft username should open all the doors to the ubisoft games you registered for or want to play, in which case you'll have to re-identify your nickname.