So i bought FC ND when it was on sale sale and it launched perfectly fine opened my uplay and everything (and i know it opened the right one cause this is the only uplay i have on my pc) and then i have the dumb authentication of ownership thingy..
Hey TVC_Zexy! This error occurs when you are logged in to the incorrect account that you bound the game with originally. Please log in to Uplay with the correct Ubisoft Account and you should be able to play. Let me know if you need help finding/recovering said account.