Office 365: DNS health checks and the Office 365 Portal
In recent weeks I have worked on several escalations regarding the DNS health checks in the Office 365 portal. In August I published some guidance on how to review and handle these errors. That article has since been updated to reflect new information and new portal behavior. Please check out https://blogs.technet.microsoft.com/timmcmic/2017/08/15/dns-errors-and-warnings-in-the-office-365-portal/ for updated information.