Takes Two Nintendo

Me and my friend were trying to connect to play but it would say connect error for myself when I would accept their request and the same for them when they would try to accept mine. We would close the game restart our Nintendos and the same thing kept happening to the point where the game wouldn’t even load and would shut down on its own. This happened the first time we tried to play but eventually got it working after about 20 minutes we tried for 50 minutes and nothing worked.