For the past few years as an SCCM admin, I have become accustomed to Microsoft’s semi-annual release of the latest version of Windows 10 and patching it is usually seamless and does not require making any changes to WSUS / SCCM.
However, it seems that Microsoft has made a significant change starting with version 1903 and beyond, system administrators of WSUS / SCCM must select “Windows 10, version 1903 or later” in order for those systems running it to be updated. See Microsoft’s announcement here.
Special shout out to Bryan Dam (damgoodadmin.com) and Mary Jo Foley (ZDNet.com) for bringing this to the attention of the masses. Saves me a support call to Microsoft that’s for sure!