Microsoft has just released the following KB Article:
The Intune Connector role cannot access the Intune service when the Intune Connector requires a proxy in System Center Configuration Manager
The Intune Connector site system role in Microsoft System Center Configuration Manager may not connect to the Intune service if the following conditions are true:
- The Intune Connector is installed on a Central Administration site (CAS) or on a server that is remote from the top-level site (that is, from the CAS or from a stand-alone primary site).
- The Intune Connector requires a proxy to access the Intune service.
Errors that resemble the following are logged in the dmpDownloader.log file.
Note These entries are truncated for readability.
Additionally, errors are logged in the Cloudusersync.log file that resemble the following: