The Battle.net desktop app failed to communicate with the Blizzard Update Agent, which is required to install, update, launch, and uninstall Blizzard games.
Update your drivers and operating system to resolve any compatibility issues.
Run a security scan to remove any viruses or malware infections.
Update or temporarily uninstall any security programs, which may mistakenly identify the login module as a security threat.
Create a new administrator account to resolve permissions issues.
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