Troubleshooting steps when you can log into your account management page but not the Blizzard Battle.net App
Log in with Blizzard allows third-party sites and apps to extend the Blizzard experience and leverage Blizzard services.
Troubleshooting for error "Too many attempts" when trying to log in to the Blizzard website
Can't log into Blizzard website or get online when logging with the Blizzard Battle.net desktop app.
How to obtain error logs for Blizzard games
Information on the Blizzard Authenticator
Customer Support can assist in recovering Blizzard Accounts if provided with necessary information.
A BattleTag™ is a player-chosen nickname that identifies your Blizzard account
How to remove your Blizzard Authenticator
Information on Blizzard Phone Notifications