M.2 slot compatible with Gigabyte B450 ITX model
M.2 slot compatible with Gigabyte B450 ITX model
The board supports SATA M.2 SSDs, yet the motherboard could be refusing to accept the drive because it already hosts an operating system. The Windows installer media appears to work as expected. It’s unclear why access is denied despite the OP being able to reach Windows.
I figured it out. Just needed to take the car out and put it back in correctly.