[2020] [Keys/Codes]I can't play siege any more

I bought rainbow six on my pc a while ago and I played it for a few weeks but then moved back to playing it on the pc. Now when I try and play the game it asks me for an activation code on uplay where I bought the game but I don't remember having an activation key. I've logged in on the same account that I bought it on with the same email but the game doesn't allow me to play it without the key.