I'm guessing it's probably some sort of verification that has to be done prior to activating the card. I have heard that Fraud will lock or freeze an account because of any "old" or "incorrect" information when reviewing new accounts. Do you have any changes or updates that were made (new address, name change, any fraud breach you may have been part of, etc.) If so, it could be for that. I would reach out to the fraud dept. for more info and if they say someone will reach out to you, keep trying. Someone will respond.