2) Allow Alice to verify that the new account is also hers, and invite it into chats her old account is in. This might be done with a tickbox list of all Direct and group chats, with an all/none toggle button. For Direct chats, the app would need to warn that joining the new account boots the old one, via an automatic admin request from the old one to leave the room.

Maybe this could reuse the session system that she uses to verify new logins by the same account, in different apps?

(6/6)