My account has been added into two developer teams, however, Xcode preferences > Account displays only one team, which is added most recently.
I tried to restart Xcode serval times, and nothing changed.
Suppose team names are A and B,
if A adds me again, B disappears in Xcode preferences' account pane,
and if B adds me again, A disappears.
Do you encounter the same issue with me?
Is a bug of Xcode 10.2.1?
I'm having this same issue.