Hey everyone! If you are having issues joining, try doing the following: Restart your game Restart your console Restart your internet/wifi Respectively Threaten your Wii U Complain to the Pretendo Forum about the problem.
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THE STEPS 1 2 3 4 5 NO WORKING :( ;( ;O
Also one thing I forgot to mention is to keep trying, because I get the same issue too and it usually works after trying over and over again.
It's not working, i tried everything (even spamming A)
THIS THING IS NOT WORKING!!!!