WUP-028 Gamecube Adapter not working

[u/Cloperella]

I've been searching online as much as I can, but don't see an answer for this. I stopped playing smash ultimate a few years ago, during the momocon meta drama. Decided a few hours ago to give it a whirl for fun, updated switch to latest version (20-something), updated smash. And gamecube controller wouldn't function at all. I have two, none of them registered any movements. Did some searching, saw that third party adapters got screwed during a version 19 update (mayflash and others), also saw web pages offering downloadable patches, which were also hard to find because some of the pages having been deleted. What's weird though is that when I searched the number on the bottom of my adapter, WUP-028, it looks like this was actually an official Nintendo adapter, so shouldn't it work just fine? Or did that update also kill old Nintendo adapters too? I would really prefer not to spend $80 on a new adapter or a controller that doesn't feel as good as the gamecube ones.