Well, I believe they did say they wont do it when u do your initial setup for ur wiiU until you link an account but sucks either ways. You should call Nintendo to see if they can do something about it so you can get it working!
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850