When attempting to use the Dynamics 365 App for Outlook on Outlook desktop, you see a blank page instead of the application loading as expected.
Cause 1: This can occur if not all of the URLs used to authenticate and access Dynamics 365 are in the same Internet Explorer security zone.
Cause 2: This can occur if the LocalLow folder has an incorrect integrity level. The correct setting is to have the integrity level set to low as the folder name indicates.
Cause 3: This issue can occur if an issue is cached in Internet Explorer or Edge. If this was previously working but quit working recently, this is most likely the cause.
Cause 4: Microsoft is aware of an issue that can occur under the following conditions:
You are using Windows 10 with update 1903 or higher
Your organization is configured to use Dynamics 365 Online with Exchange on-premises
You are using Office 365 ProPlus with a version prior to 1910
Use the steps in the following article to verify each of the necessary URLs are in the same Internet Explorer security zone.
Open a command prompt.
Run the following command:
icacls %userprofile%\Appdata\LocalLow /t /setintegritylevel (OI)(CI)L
If you are using Office 365 version 16.0.11629 and Windows 10 version 1903 or later, follow these steps as Office Add-ins are now using Microsoft Edge WebView:
Install Microsoft Edge DevTools Preview
In Outlook, launch the Dynamics 365 app for Outlook
Run Microsoft Edge DevTools Preview
You should see Dynamics 365 (EXP) as a debug target
Click on it to launch the “F12” tools
Go to the “Console” tab
Open the app again in Outlook
If you are using early versions of Office 365 and Windows, use the steps in the following article to clear your Internet Explorer cache:
If you are using a Mac, refer to the following article:
If the conditions mentioned in Cause 4 are true, install Office update 1910 or later which includes a fix for this type of issue.