Error code 101-0502 today night :(
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if anyone wanna find me and play on splatoon 3, add my sw fc --> 0529-0431-9805.
To fix online error codes, try to enter system settings, then leave and run spl1. That works for me!
I started from splatoon 2, the 3 and now splatoon 1. Wii U > Switch online is free!! thx pretendo!!!