Ran into this fun one today, admittedly it was in my dev environment and is not a common scenario for our clients, which usually have much larger networks and network segments.
Trying to install the ConfigMgr client, via client push or manually, fails with the below error repeating in ccmsetup.log
Download Update: A recoverable error has occurred. A retry attempt will be made. Error: 0x80200010, Description There are currently no active network connections. Background Intelligent Transfer Service (BITS) will try again when an adapter is connected, Context: The error occurred in the Background Intelligent Transfer Service (BITS) queue manager.
It occurs when no default gateway is configured or pingable, even if the machines are on the same subnet as the server. The workaround is to add a pingable default gateway to the network adapter.
It’s an issue with BITS in Windows 10 1903 and continues to be an issue with 1909, it has already been logged with Microsoft and is supposedly fixed in 20H1.