"Can you post the make & models of the computers affected and can I suggest you perform a repair install instead of a clean install."
OK, the PCs effected are: 1) HP Touchsmart 300 AIO running Windows 10 Pro OS, 2) MSI GX70 3BE Laptop running Windows 10 Pro OS and 3) Brand new custom built Gaming PC (ASUS X370 MB, Ryzen 1800X, Samsung 960 pro 512gb, RX 560 GPU) running Windows 10 Pro OS.
As you can see they are all different HW generations and models running Windows 10 Pro OS. I have another 5 Windows 10 Pro 1803 PCs in the family that I am holding off running Windows Repair tool until I see a solution...
I ended up finding a pre-1803 system restore file and restored to that state - still took awhile - 12 hours...