As a follow-up, as it seems many people have reported the inability to link the card to existing online logins upon approval, I received the physical card today and didn't have any issue now linking it to my existing login, after first removing the card from the new login I created last week.
Had the same problem. Called in and they said it was because the balance transfer option hadn't been selected either way. I said no and they fixed it, then i was able to.