sha256 fail on iso in Windows 11

[benadam5721]

Hashes match fine manually, just seems (to me) to be a case sensitivity issue in Windows as the download is in lower case and the sum (and get-filehash) returns the hash in upper case.

I'm running the following in windows powershell:
sha256sum -c ./secureblue-silverblue-nvidia-hardened-20251106.iso-CHECKSUM

Then receiving the following error:
secureblue-silverblue-nvidia-hardened-20251106.iso: FAILED
sha256sum.exe: WARNING: 8 lines are improperly formatted
sha256sum.exe: WARNING: 1 computed checksum did NOT match