Any conditional access policy set for Exchange Online? For example, which blocks basic authN or modern authN clients.Tried Microsoft Support and Recovery Assistant.Anything broken with Autodiscover - Fiddler usually helps here.

Have you tried to clear the Windows Credential Cache?Īnything broken with Autodiscover - Fiddler usually helps here.Outlook will show a nice Password Required message in this case. Just wanted to throw out there that Fiddler is probably not the best way to test AutoDiscover. I would recommend to use either the builtin Outlook Autoconfiguration Test and the Microsoft Remote Connectivity Analyzer (particularly the Outlook Connectivity test and the Exchange Online Custom Domain DNS Connectivity Test). The Remote-Analysis site cannot test your on-premise DNS, or check your Active Directory for an SCP record that might be getting in the way - neither would Fiddler. However, the Outlook Autoconfiguration Test DOES test these on-premise problems as well. #MICROSOFT OUTLOOK IDENTITY ERROR ON MAC WINDOWS 10#.

Microsoft outlook identity error on mac