Enable access to social features when using multiple Web Applications

When running multiple Web Applications under different Application Pools (with different Application Pool Users) you should make sure that those Web Applications have access to the MySite Web Application. If they don’t have access to the MySites this may cause issues when linking content to the Newsfeed from other Web Applications or when using social features provided by the Work Management Service Application (i.e. Tasks).
You’ll get the following error in the Application Log of the Event Viewer:Log Name: ApplicationSource: Microsoft-SharePoint Products-SharePoint FoundationEvent ID: 3760Task Category: DatabaseLevel: CriticalUser: NT AUTHORITYIUSRDescription:SQL Database ‘Content_MySite‘ on SQL Server instance ‘SQLSERVER‘ not found. Additional error

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Quelle: https://www.techtask.com/enable-access-to-social-features-when-using-multiple-web-applications/