As per screenshots, me and my girlfriend were playing multiplayer (I'm the host, she's the invitee). Randomly, we both got disconnected, and as the host, I was informed that "This game is currently running in offline mode. Would you like to sign in?".
Upon clicking "Sign In", it waits to connect for 8-10s before aborting with a "Connection Failed. Try again Later".
I'd understand if the invitee gets kicked out, but why would I as the host not be able to rejoin?