I'd like to know if there's a way to play on different islands on the same Switch system.
(For those that don't known, every account on the system share the island the first player created)
I had the exact same problem yesterday after updating from ReiNX 1.7 to 2.0.
I just could not make the 2.0 version work, so I went back to 1.7. I'm also on 6.1 with a XAW7001 console.
Serial: XAW700177XXXX
Serial on device matches serial on box: Yes
Region: US
Firmware: 4.1.0
Color option: Neon
Store: -
Was a bundle (if yes, which): No
Purchase date: 11/10/2018
Fusée Gelée works: Yes (tested)