I tried to do that back when BC2 first came out, and their stupid online crap didn't recognize half of the legit CD-keys I used for BFV, BF2, etc.
yep the VIP website was wonky back when BC2 launched. no idea if it's any better now, i haven't bothered to go back and try again.
It's not any better now. I ended up contacting their support, telling them what my issue was and what I was trying to do, and they fixed it for me. *shrugs*