Another Future Soldier question..

Okay, I traded with a user on here for Future Soldier (not naming them since it might not have been their fault)

I activated it on Uplay, went fine (using the ID shortcut thing), got an installer (offical ubi one) and installed it, says the code is invalid despite it already being activated, Ubi support tested the key and are saying its for the steam version, and I need to launch it through Steam, but I don't have it on steam.

Am I probably SOL?