Cannot connect to my Dynamics 365 environment

Question

Hi everyone,&nbsp;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 sign in to Dynamics 365","title": "Try signing in again","details": "No such host is known.","troubleshootingLink": null,"sessionId": "cf9deba0-363d-4ab3-a132-74d60df93e65","activityId": "0da9aa0d-651c-49c0-840e-e3283c4598b0"}&nbsp;I am admin (tenant and sys admin on the Dynamics environment with the role as well) and is does not connect. What should I do now?&nbsp;Thanks in advance!

samjar · Answer

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 · Answer

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 · Answer

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

jan_havel · Answer

Thanks,&nbsp;StevenV85&nbsp;&nbsp;Switching back to the old look did remove the error message and Sales Copilot started working fine.&nbsp;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 · Answer

Acknowledged the problem with new Outlook - we are investigating the issue.  Hope to get an update soon...thanks!Sam

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Cannot connect to my Dynamics 365 environment

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