Switch Cant find local multiplayer on switch

hibiki

Newcomer
Ive been hosting local coop with my bf. it was going well until we tried to play the game in local at my place. i tried letting him host and it worked but i cant host the farm we played on for hours. is there a fix? whats going on. Online multiplayer coop works but it lags a lot so we really prefer local coop. please help!
 
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