We’re unable to connect to your Microsoft Dynamics 365 server

 

Error "We’re unable to connect to your Microsoft Dynamics 365 server" when using Dynamics 365 App for Outlook

---

Symptoms

---

When attempting to use the Dynamics 365 App for Outlook, you receive the following message:

"We’re unable to connect to your Microsoft Dynamics 365 server. Please try closing and reopening the app."

Cause

---

This error can occur for one of the following reasons:

 

Cause 1: An issue is cached by your web browser. 

 

Cause 2: Your Dynamics 365 security role is missing one or more required privileges.

 

Cause 3: The Dynamics 365 App for Outlook does not receive a response when requesting a page from the Dynamics 365 server.

Resolution

---

Resolution 1: Clear your web browser cache. 

If you are using Outlook Desktop, Outlook uses Internet Explorer to display the web pages. For information about how to clear the Internet Explorer history and cache, see View and delete your browsing history in Internet Explorer.  

IMPORTANT: If this error appears to be resovled after clearing your web browser cache but eventually returns, see the following article for a potential solution:

https://support.microsoft.com/help/4341413

Resolution 2: Verify your Dynamics 365 security role includes all of the required privileges documented in the following article:

Required privileges for Dynamics 365 App for Outlook

Resolution 3: Check to see if your Dynamics 365 (online) organization is not available or something is blocking communication with Dynamics 365 (online). Verify you can access your Dynamics 365 organization via your web browser. If you cannot access your Dynamics 365 organization via your web browser, the Dynamics 365 App for Outlook will not be able to access your organization either. If you are unable to access your Dynamics 365 organization with your web browser, contact your Dynamics 365 administrator.