When attempting to use the Dynamics 365 App for Outlook, you receive the following message:
Sorry, something went wrong. Please try again, or restart the application.
Error code: Error_Message_0x80070000"
Cause 1: Your Dynamics 365 security role is missing one or more required privileges.
Cause 2: An issue is cached by your web browser.
Cause 3: The Dynamics 365 App for Outlook does not receive a response when requesting a page from the Dynamics 365 server.
Resolution 1: Verify your Dynamics 365 security role includes all of the required privileges documented in the following article:
Resolution 2: Clear your web browser cache. For information about how to clear the Internet Explorer history and cache, see View and delete your browsing history in Internet Explorer.
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.