If there is no session with fairchat.net you have to reenter your workspace adresse to get a connection
We have an open ticket in support https://git.fairkom.net/hosting/support/-/issues/123 and it is reproduceable on android. If I have no session on fairchat.net I always get kicked out of my workspace when the app is closed. When I open the app again i automatically get send to the Login to fairchat.net. I can return to the site where I can enter my workspace and I will be logged in if I still have an active session.