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We have a problem on our SharePoint 2013 on-premises system where the alert Url is not accessible. Has anyone had any experience with the PowerShell Script Invoke-AlertFixup?
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This worked for us. https://social.msdn.microsoft.com/Forums/en-US/fe9dc28f-8573-4cde-b3c5-70f4cbde5c2c/extranet-alert-emails-have-intranet-urls it involved configuring cross-firewall access: