W10 MediaCreationTool wont Recognize FlashDrives

Are you flashdrives recognized inside Windows itself (My computer, Disk Management etc).

Could be a formating issue, could be a problem with a USB port (try others - USB2.0 is usually a safe bet), or could be a defective flash drive (although you used plural).

You could also simply download the ISO and create a bootable USB via third party tool like Rufus if the creation tool is simply broken.