Server Version#: 1.18.7.2438
Player Version#: 4.22.2 (Web)
I invited a friend to my server and it seemed like it worked fine. He then sent me an invite to his server…but I think it might have been a different type of invite.
Now, I have to select user when I login. I went to the Users & Sharing section and I see his information there. His username has “Admin” and a picture of a crown as well as a locked lock. Mine just has my email address and an unlocked lock. I hover over his name and I don’t see any way to remove him (no X to the right).
Your friend added you to his Plex Home (rather than simply sharing his library with you), and since you can only be in one Home, you essentially gave up your status.
On the Users & Sharing page, click the X on your own user. The prompt should ask you if you are sure you want to “leave this home.”