Decrypting the VM was the trick - thank you!
I had to first remove the vTPM in order to decrypt. This wasn't a problem with my Windows 10 instance (which doesn't require a TPM module). It may be tricker with my Windows 11 instance (which does require a TPM module) but I'll give it a try.
I don't recall why I encrypted my VMs given they don't contain sensitive information. Something fun to try I guess!
Thanks again.