An error occurs when attempting to reinstall Windows on Mac

Hi all,

Having issues getting Bootcamp installed on my 2019 Mac Pro. I've had bootcamp installed on this machine before successfully, but now I'm hitting a wall.

Using Bootcamp Assistant, I'm able to create the Windows partition, load up into the Windows installer, but that's where it falls out of the sky dead. When the Windows installer starts doing its thing, I'm greeted with "Windows cannot locate the disc and partition specified in the unattended answer file's <ImageInstall> setting. Make sure the setting references a valid partition and restart the installation."

Steps I've taken so far:

1.) Reset the NVRAM

2.) Wipe the SSD and re-install macOS

3.) Downgrade macOS to Catalina before Bootcamp install

4.) Boot Windows installer from a flash drive and attempt to install from there

All of these steps lead to the previously referenced Windows installer error.

This is a head scratcher for me. Does anyone have any ideas?

[Re-Titled by Moderator]