I also have the official Wii U USB adapter and mine works just fine. I had a similar problem when starting, so EVEN THOUGH IT'S 3 IN THE MORNING, I GUESS I'LL TRY TO FIGURE IT OUT
AGAIN. FOR YOU. J/k, I have nothing going on tomorrow, who am I kidding? Let's take a look.
First question:
Are you seeing anybody?
No, I'm joking, the first question is "Do you have Dolphin 4.0-7840 installed?"
If not, do it. I had 4.0.2 initially and it was pretty much Clown Town. Unplayable for Melee Netplay.
Second question:
Do you have Zadig installed?
If not, do it. I'm no computer whiz from an 80s movie, but it's the program that lets your computer know it's got a controller plugged into it.
Third question:
Two-parter, watch out:
1. Did you calibrate your controller properly?
2. Did you activate the thingy before you started Dolphin? (it's 3 am. Give me a break on vocabulary)
Fifth question:
Tricked ya. It's the fourth question. Last one was a two-parter, remember. Keep up.
Does your Dolphin still read "Adapted not detected"?
Mine does too, but that doesn't mean it won't work. Try it out.
So, these questions probably didn't help. I'm gonna give you some helpful links that solved my issue in case it's beyond my powers of technowizardry:
https://www.smashladder.com/guides/view/258h/controller-setup-guide
https://wiki.dolphin-emu.org/index....eCube_Controller_Adapter_for_Wii_U_in_Dolphin
https://www.youtube.com/watch?v=-Unb3pM30PM
https://www.youtube.com/watch?v=MhtednkzJl4
That last one is just a link to "Dreams" by Van Halen in case you're frustrated and need some motivational tunes.
There's also a reddit page for this I think, but at 3 am, I can't find it.
I may or may not have helped, and I am 100% sure I wasted your time with like 75% of the words written here. I am so sorry.