Offline glitch but even weirder
My friend and I tried to play some duel rounds at a private party, but the lobby was bugged. My friend joined the lobby, but I couldn't see him on my screen, and he couldn't see me on his. The design was bugged as well, and I couldn't start the game mode.
Because of that, we decided to play some team duels, but I was shown as offline even in my own lobby. The invitation I sent also didn't reach my friend.
I can still pay multiplayer alone, which makes it even weirder.