Yeah, I posted this same issue in the DD section, too. Only been matching with other switch users with crossplay enabled since the last update.

neutchsatchel_NSW
@neutchsatchel_NSW
Posts
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Yeah, I get that, but usually they don't have a choice
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Can any switch users confirm if multiplayer crossplay has been working for you since the last update?
Even with crossplay turned on, the opponent search has been buffering until it finds another switch user since the last update for me.
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Same for me...seems like cross play isn't working properly for switch — even with cross play on, it's waiting until it finds another available switch player
Nintendo switch users
Nintendo Switch crossplay
Nintendo Switch crossplay
Can’t find online game ??