Worked a charm. Thanks!
Scratch that, it worked, wasn't using US Nintendo account. Thanks OP, heat, obviously.
Actually in the US at the moment, did this, got code, got confirmation emails, code doesn't work, no history of order on gamestop, this this is iffy at best, but good effort but OP. Contacted Customer Service as I'm actually buying it legit!
Limited allocation at a certain price?
I've put a lot of time into this, it could even be my most played Switch game. It's brilliant. Steep learning curve, which I think is responsible for the negative reviews, but once it clicks for you it's impossible to put down. I highly recommend it.