Outlook - After Migration to O365 Unable to connect to Outlook

MK 66 Reputation points

I have an account recently migrated to o365, after migration unable to connect to Outlook.

webmail works fine, unable to create new outlook profile as well.

account is assigned with correct license and has the right version of outlook installed.

Any advices Please?

Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
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  1. JeffYang-MSFT 6,241 Reputation points

    Hi @MK ,

    After migration unable to connect to Outlook.

    Are there any error messages when this issue occurs? If so, please try to provide me with the specific error message for further research.

    Unable to create new outlook profile as well.

    Do you mean that you have trouble with creating new outlook profile? Or the configuration issue will still continues after creating a new outlook profile?

    I did some research and found some information which might be related to your issue. According to the document, issues like this may occur when the name of the pre-migration Autodiscover server is cached in your Outlook profile in the registry. So, it is suggested to try ExcludeLastKnownGoodUrl to prevent Outlook from using the last known good AutoDiscover URL and see if this issue could be resolved.

    Please try to configure one of the following registry subkeys as follows:
    DWORD: ExcludeLastKnownGoodUrl
    Value: 1

    DWORD: ExcludeLastKnownGoodUrl
    Value: 1

    (Note: Serious problems can occur if you modify the registry incorrectly. Before making changes, back up the registry to restore it in case something goes wrong.)

    For more information, please check this document: After migration to Office 365, Outlook doesn't connect or web services don't work.

    Hope this can be helpful.

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