Showing confirm you phone number in outlook

Md. Mahfuzur Rahman 201 Reputation points

We have exchange 2016. we facing issue in outlook. showing confirm your phone number in outlook. if we close this windows showing need password. we are facing for most of the users. how we can resolved this issue. ![89598-image.png][1] [1]: /api/attachments/89598-image.png?platform=QnA

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Kael Yao-MSFT 21,611 Reputation points Microsoft Employee

    Hi anonymous user

    What version of Outlook are you using? From your screenshot it seems to be Outlook 2016.
    You can check the version and the build number via File > Office Account > About Outlook.

    If you are using Outlook 2016 version 16.0.6741.2017 or some later versions, the issue may be caused by Outlook trying to connect to Microsoft 365.
    To confirm it, you may run a Test E-mail Autoconfiguration via the Outlook client and check the results under the log tag to see if autodiscover is working properly.

    If it is the cause of the issue, you may need to:

    1. open registry on client device
    2. locate HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscover
    3. add a DWORD value named "ExcludeExplicitO365Endpoint" and set its value to 1
    4. restart Outlook and see if the problem persists

    If the response is helpful, please click "Accept Answer" and upvote it.
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