Launch SQL Server Management Studio.
Expand the Active Administrator database.
Right click the tblDiscoveredDomainControllers and choose to edit top 200 rows.
Verify these particular domain controllers are listed.
If the "PendingInstall" is set to False, then change them to True.
They should now appear under Auditing & Alerting - Agents - Auto Deployment - Pending Installations.
If issue persists, please Contact Support.