Information about this error when redeeming a key in your account

How to resolve mistakes claiming a CoD key on the wrong Battle.net account

Information on error message BLZBNTBGS8000001C.

What to do if you receive an error that your code is already claimed in your account.

Troubleshooting the error message "The code you entered cannot be claimed."

What to do if you can't claim your Call of Duty: Black Ops 4 key

Troubleshooting claiming a Call of Duty: Vanguard key

Information on Error BLZBNTAGT00001399

You have attempted to connect to an invalid server. If this problem persists, please contact Customer Support.

Information about error BLZBNTAGT000008AE.