Red Alert 3 asks me to Redeem game's code, but the code won't work

So,I bought the Full C&C Collection. Which of course came with Red Alert 3. But trying to play Red Alert 3 is basically impossible apparently, because when I try to, it basically says that I gotta redeem the game's key/code.

Okay, fair.

But the redeem code button on the popup doesn't works.
Okay, so I'll just try and redeem it on Origin's launcher itself

BUT the Origin's launcher tells me the code has ALREADY been redeemed.

But when I try to launch Red Alert 3, I get that popup REGARDLESS.

So what in the name of all that is holy do I do?