I will double check both ways, I think for the most part the legit switch has been opening the gates and then the hacked one had no issues coming over. I would have thought we have traveled from legit to hacked but its possible we havent gone that way yet. Will check now if the kids are not playing other things on them.
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Actually that was exactly what they were doing when I went down, hacked switch oppened the gates and the legit on picked local play and seen the hacked ones island right away to fly to. So I have had no issues going between both.
Both on the latest firmware, both with the latest update on the game, no Nintendo ID for hacked switch, digital version of the game on legit switch. Since the hacked console has never been online it should not be banned in anyway. Not running any special things on the hacked switch, just the latest Atmosphere, no cheats.
Hope you get it going, we would be so bummed if we couldn't, 2 players on the same console is lacking so being able to play together locally is great and we did both hemispheres so we can have dual seasons and access to more variety of resources.
Let me know if there is any specific settings or anything I can check or confirm for you.