You might like to refer to these, for starters . . .
Windows 11 VM encrypted after password change on host (2023-09-21)
Unable to recover Windows 11 VM (2023-09-11)
What Password does a Win 11 VM need to run on a different host? (2022-09-04
Windows 11 VM asking for encryption key after host updates (2022-03-09)
What is the default encryption password for virtual TPM? (2022-07-19)
VM encrypted itself, don't know the password (2021-10-28)