An email or appointment tracked with Dynamics 365 App for Outlook shows as "Track pending"

When you track an email or appointment using Dynamics 365 App for Outlook, the email does not appear in Dynamics 365. When you view the item with Dynamics 365 App for Outlook, the item shows as "Track pending...".

If the item appears as Track Pending but is eventually created in Dynamics 365 and switches to Tracked, this may be expected. Review the "Synchronization and tracking" section of the D365 App for Outlook Users Guide to understand if it is expected the item will be created immediately by the app or if Server-Side Synchronization will be responsible for creating/tracking the item. If the item shows as Track Pending instead of Tracked, that is an indication the item will be processed by Server-Side Synchronization on the next sync cycle which could take up to 15 minutes.

If the item appears as Track Pending for more than 20 minutes, refer to the Resolution section.

If an item shows as Tracking pending for more than 20 minutes, verify the user's mailbox record in Dynamics 365 is configured to use Server-Side Synchronization and the mailbox is successfully tested and enabled. 

1. Access Dynamics 365 as a user with the System Administrator role.
2. Navigate to Settings and then click Email Configuration. 
3. Click Mailboxes and then change the view to Active Mailboxes. 
4. Locate and open the mailbox record for the user.
5. Verify the Incoming Email option is set to Server-Side Synchronization or Email Router. If the item is an appointment, verify the Appointments, Contacts, and Tasks setting as well.
6. If the Incoming Email Status does not already show as Success, click Test & Enable Mailbox and make sure to select the checkbox that appears in the dialog. 
7. If the mailbox tests do not succeed, review the messages in the Alerts section. If an alert includes a Learn More link, click this link for additional details.

If the mailbox was already tested and enabled successfully, review the Alerts section within their mailbox record. If Server-Side Synchronization was expected to create the item in Dynamics 365, any errors should be shown in the Alerts section.