Added troubleshooting tips to workplace doc

Author: v-sonan

articles/active-directory/saas-apps/workplacebyfacebook-provisioning-tutorial.md

@@ -153,6 +153,9 @@ Once you've configured provisioning, use the following resources to monitor your
 2. Check the [progress bar](https://docs.microsoft.com/azure/active-directory/manage-apps/application-provisioning-when-will-provisioning-finish-specific-user) to see the status of the provisioning cycle and how close it is to completion
 3. If the provisioning configuration seems to be in an unhealthy state, the application will go into quarantine. Learn more about quarantine states [here](https://docs.microsoft.com/azure/active-directory/manage-apps/application-provisioning-quarantine-status).
 
+## Troubleshooting Tips
+*  If you see a user unsuccessfully created and there is an audit log event with the code "1789003" it means that the user is from an unverified domain.
+
 ## Additional resources
 
 * [Managing user account provisioning for Enterprise Apps](../manage-apps/configure-automatic-user-provisioning-portal.md)