Hello!
I personally use SSSL to connect to pretendo since I tried homebrewing my WiiU for hours and it didn’t really wanna work for me so I just opted for the simpler option.
When I set it up yesterday, everything worked fine and I played some Splatoon matches, I’d say about 5, maybe? When I logged back info the console today, it started giving me the message “Unable to connect to partner’s device, as partner did not respond”. I don’t know where it came from and when I searched up the code in the Pretendo Troubleshooting, it just showed “Unknown Cause” and “Unknown Solution”. I was really excited to play Splatoon again yesterday and this is upsetting me a lot honestly I don’t know what to do about this or what made it happen considering everything worked fine yesterday