outlook issue after ADMT migration

Eprs_Admin used Ask the Experts™
Hi Experts,

after a migration from computer, user and profile to a new domain we face some error.
When the migrated client logs in, opens outlook, then it is not working. They use Office365.

When I disable the modern authentication, then it works.
Do you have any ideas about this issue ?
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NoahHardware Tester and Debugger

Hi there! :)

As a start, try opening Outlook in safe mode? When using Outlook in safe mode, disable all add-ins to check this issue. After that, if you can't find the problem, the other way is to just go straight into activating Office 365 Repair on the Control Panel.
Richard InnesSenior Consultant

I would recommend running the fiddler application with Office 365 extension enabled to see what is happening when you have modern authentication turned on - https://techcommunity.microsoft.com/t5/Exchange/The-Office-365-Fiddler-Extension/m-p/289469.  This should help you identify where the problem is.

Eprs_AdminSystem Architect


Hi, do you have more experience with this application ?

Where do I find some manuals ?
Senior Consultant

Sorry for the delay, this article from the Office365info blog is in reference to troubleshooting Autodiscover so should assist in what your looking to do - Using Fiddler

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