Reporting Joesgem/Joegem for cheating. When I joined the lobby and saw these similar usernames I already knew to expect cheating. They played as both framer and SK. Although framer died first, they still had an advantage as SK by knowing who the mafia were. They won.
Screenshots as proof:
https://ibb.co/c8Cyy9T
https://ibb.co/vzDGvpY
https://ibb.co/D1vBD8g
In the first screenshot, it shows the lobby with both players. Joesgem probably 'referred' their other account to get the grim lobby icon. I'm not sure if that is against the rules. In the second, it shows the SK has won. In the last it shows that Joegem was SK and Joesgem was framer.
I couldn't find a way to report this in game, so hopefully this is the right place.