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Johnny51195's avatar
Johnny51195
Copper Contributor
Aug 06, 2023

Cannot connect to my Dynamics 365 environment

Hi everyone,   I cannot connect to my D365 CE environment within Outlook. It provides an error: { "errorcode": 4255, "message": "To use Sales Copilot, sign out of the app, open it again, and sig...
Dynamics CRM connectivity
Jan_Havel's avatar
Jan_Havel
Copper Contributor
Dec 14, 2023

I have the same problem. Works well on the web (browser) but fails in the new Outlook desktop app on Windows 11. It worked for a while and now shows the error.

 

Removing and re-adding my work account did not help.

 

SamJar 

StevenV85's avatar
StevenV85
Copper Contributor
Dec 14, 2023

Jan_Havel I had the same issue, but then switched back to the old look in the Outlook app and it fixed the issue.  

  • Jan_Havel's avatar
    Jan_Havel
    Copper Contributor
    Dec 14, 2023

    Thanks, StevenV85 

     

    Switching back to the old look did remove the error message and Sales Copilot started working fine.

     

    When I switched back to the new look and immediately tried, the Copilot would hang on starting (without showing an error). After a system restart, the error message in the new look came back.

    • SamJar's avatar
      SamJar
      Icon for Microsoft rankMicrosoft
      Dec 14, 2023
      Acknowledged the problem with new Outlook - we are investigating the issue. Hope to get an update soon...
      thanks!
      Sam
      • SamJar's avatar
        SamJar
        Icon for Microsoft rankMicrosoft
        Dec 15, 2023
        The issue is now resolved. You may need to restart Outlook once but then will work.
        Do let us know if you see any other issues with the new Outlook client.

        Thank you!
        Sam

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