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

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

The Blizzard Update Agent could not install in the specified folder location.

Troubleshooting claiming a Call of Duty: Black Ops 4 key

Information about error BLZBNTAGT000008AE.

Unexpected Blizzard Update Agent errors.

Information on Error BLZBNTAGT00001399

Decryption key is invalid or missing. Please uninstall and reinstall.

How to solve this problem on an incomplete Battle.net account

Information on error BLZBNTBNA000007D0