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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
SamJar's avatar
SamJar
Icon for Microsoft rankMicrosoft
Aug 08, 2023
Hi Johnny,
Sorry to hear that you are having problems connecting, are you seeing this problem with Outlook Desktop or Outline online? Could you share the steps you took to get to this error?

thank you,
Sam Jarawan - Sales Copilot - Product Manager
  • 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.

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