Hyper-V\Set-VMFirmware fails for hyperv-vmcx

_This issue was originally opened by @Kmdkca in https://github.com/hashicorp/packer/issues/11399 and has been migrated to this repository. The original issue description is below._

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Packer version 1.7.8 on WS2019

When using hyperv-vmcx to create a gen2 vm with secureboot it fails to set secureboot.

`Cloning virtual machine...
==> hyperv-vmcx: Error setting secure boot: PowerShell error: Hyper-V\Set-VMFirmware : 'Win11US' failed to modify settings.
==> hyperv-vmcx: Cannot modify the secure boot template ID property.
==> hyperv-vmcx: 'Win11US' failed to modify settings. (Virtual machine ID DD4F3DCE-083F-4F7B-B2C7-53E45B2B67EC)
==> hyperv-vmcx: Cannot modify the secure boot template ID property after the virtual TPM is initialized.
==> hyperv-vmcx: At C:\Users\PackerAdmin\AppData\Local\Temp\2\powershell1563918022.ps1:6 char:2
==> hyperv-vmcx: + Hyper-V\Set-VMFirmware -VMName $vmName -EnableSecureBoot $enableS ...
==> hyperv-vmcx: + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
==> hyperv-vmcx: + CategoryInfo : NotSpecified: (:) [Set-VMFirmware], VirtualizationException
==> hyperv-vmcx: + FullyQualifiedErrorId : OperationFailed,Microsoft.HyperV.PowerShell.Commands.SetVMFirmware`

I can manually run the command "set-vmfirmware Win11US -EnableSecureBoot on" without issues.
Also using the hyperv-iso is able to set it.

So how do i prevent this error?