When you are trying to enable live migration on Hyper-V you get error message stating “Error applying live migration changes. Failed to modify service settings”

This might be result of server crash.

Luckily this is easily fixed by renaming (or deleting) corrupted policy file from folder C:\Windows\System32\GroupPolicy\Machine

Rename Registry.pol to Registry.pol_old or similar and apply live migration settings again using Hyper-V Manager.