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.
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