Humble gift links for Uplay - already own gift

I got a gift link and opened it, without looking to closely for what game it was.
It was for Assassin's Creed Origin, which I already own (it was still on my Steam whishlist, that's way I got it).
With steam games you still get the key, so I wasn't worried, but apparently this is different with uplay.
It want's me to now connect to my uplay account.
As the gift link is now used up, is there any way to gift the game to someone else now?