ERROR CODE 104-2210 support for Unmodded Wii U?

HELP! just yesterday i was playing Splatoon online without any problems, but now when i try to connect in the lobby i get an error!
Ive read around the forums for support, but all i can find is solutions oriented towards Modded consoles (which i dont have) ive heard i can delete my shared data from those modded solutions and wanna know if i need to do that for my vanilla console too?

You can do that on a unmodded console too. Just delete your shared save data for Splatoon and it should work again.

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Thank you for clarifying, imma try that now!

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Let us know if it worked!