Battle.net or game account hacked or compromised.

If your account has been compromised, the first thing you should do is check your authenticator registration and security status by referring to Account and Computer Security.

Information on where to update your Activsion Account Email

If you're seeing this message, check your email for details about the violation and a link to information on the appeals process.

This is about changing PC room member information.

What to do if a friend or family member has access to your account and has updated the account details, are preventing you from accessing the account, or has taken gold or items

Error 42003 - Information about a password reset instruction error caused by a change in the access method of the account

Information about the Cross-Play and Cross-Progression features

How to change the language of text in your Blizzard games

Information on how to change the password for an existing game