I have two laptops with Intune that both received commands to the EnterpriseDesktopAppManagement CSP to download the Intune Management Extension but Intune gave them bad mirrors. They were told to download the Intune Management Extension from https://prodamsua0402rcdata.azureedge.net/IntuneWindowsAgent.msi but it doesn't download because the mirror doesn't exist. Any ideas?
I recently experienced the same issue and opened up a case with Microsoft. Posted about this on Technet too: https://social.technet.microsoft.com/Forums/en-US/98f996f2-07eb-4a6a-b6b5-64a18d465117/intune-management-extension-fails-to-download-and-install-with-error-downloadfailed?forum=microsoftintuneprod
There are incorrect URLs being distributed to download the IntuneWindowsAgent.msi from. If you remove 'rc' from the URL (https://prodamsua0402data.azureedge.net/IntuneWindowsAgent.msi ), you can successfully resolve and download the agent manually.
As a workaround you can install the Intune Management Extension by running the MSI manually on the affected machines.
To have this fixed for your tenant you will need to open up a support case with Microsoft.