This message is displayed when no Overwatch license is on an account. Ensure you are logging into the correct Battle.net account.
Failed to launch Agent or AgentSwitcher. Please close all other applications, temporarily deactivate your anti-virus software, and try again. Alternatively, log in as an administrator and try again.
The login servers received invalid information
Information about this error when trying to log in
A community site or app throws a 404 error when attempting to login via B.net or when accessing your Battle.net data.
How to resolve this error when trying to log in to Battle.net
Information about troubleshooting loading problems on consoles
Troubleshooting for error "Too many attempts" when trying to log in to the Blizzard website