I am unable to get multiplayer to work at all on my Nintendo. Game runs beautifully. Cross play is enabled and I can see my friends game but when I try to join the game just says there is a connection error or the game just flat out crashes and I end up on the dashboard. 
 

I cannot host a game either. The game just crashes. Latest update hasn’t made any difference. Am I the only one?

other games work perfectly on multiplayer. And my network settings are all fine. My console is NAT type A so I don’t think that’s the problem. 

I just fixed this issue with mine by syncing my clock via internet on the switch