This message is displayed when no Overwatch license is on an account. Ensure you are logging into the correct Battle.net account.
Information about this error when trying to log in
Troubleshooting an issue where attempting to log into one specific character on a Diablo IV account
How to resolve this error when trying to log in to Battle.net
A community site or app throws a 404 error when attempting to login via B.net or when accessing your Battle.net data.
What to do if you continue being redirected to the login screen after entering your credentials
Information on error BLZ51901021. BLZ51900001
During periods of high login traffic, we may put you in a login queue.
What to do if you get this error when trying to use a paid service
What to do if you get a "Something went wrong" error when logging in to the Battle.net Mobile App