Sometimes when I try to log in on the app, even when my wifi is turned on, it will say this message.
I dont really get what its trying to tell me. Obviously its a failed login, but whats status code 501?
Just a guess, it might be because you are on the guest Wi-Fi network. Whenever I am on it I get the same message. Sometimes iPhones/Galaxy's just decide on their own which Wi-Fi they want.
This happened to me too. I could actually play on the guest wifi, but then i kept losing connection to the servers. Later i tried to login again, and it wouldnt let me login, saying the thing about the failed login.
Yes this has happened too me too. I was in the middle of an bobby and it said "you have lost connection to the game" when I left it said I needed to sign in so I did and it said "Roblox.Status 501"