Hi,
Is this VM generation 1 or 2? If it's a Generation 1 VM, you can recreate it as a Generation 2 VM to see if the issue persists.
If it's already a Generation 2 VM, open Hyper-V VM Settings in Hyper-V Manager, navigate to Security and uncheck "Enable Secure Boot".
Also, check the Event Viewer for any errors related to Hyper-V under Applications and Services Logs > Microsoft > Windows.