Switch [BUG] Local coop connection bug


I've been able to find several posts around about this problem, but no one seems to have a solution.
Previous posts describing my problem:

My problem: Local coop no longer available for connection after playing online multiplayer once. My boyfriend and I played locally just fine until I went out of town and we had to use online. Syncing our switch data directly has failed. Repeated attempts at reconnecting to the internet and trying local again have failed.
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