Hyper-V Embedded broken with KB5124008

resuming the conversation from:

the setup:
https://forum.devolutions.net/topics/30791/trying-to-configure-connection-to-local-hyperv-machines?message=218074#218074

the post where the problem discussion started:
https://forum.devolutions.net/topics/30791/trying-to-configure-connection-to-local-hyperv-machines?message=241627#241627

@rmarkiewicz,

Thank you kindly for your time.

Would you be willing to try one more test?

In my env, I run my primary user as excluded from the workstation administrators group. So its much more restricted.

Elevation takes place with a different user entirely. The only group it is added to is the Hyper-V group.

Would you be willing to try that?
Setup a user that is not a member of Administrators, but added to the windows Hyper-V group.
Login to desktop as this user.
Run RDM, but not elevated. Connect to localhost hyperv using this user, which is only granted by the Hyper-V group.

It may be my registry settings.

Would you be willing to export the registry settings you have?

Thanks again,
Bryan

These are mine:

AllowDefaultCredentials = Microsoft Virtual Console Service/*
AllowDefaultCredentialsDomain = Microsoft Virtual Console Service/*
AllowFreshCredentials = Microsoft Virtual Console Service/*
AllowFreshCredentialsDomain = Microsoft Virtual Console Service/*
AllowFreshCredentialsWhenNTLMOnly = Microsoft Virtual Console Service/*
AllowFreshCredentialsWhenNTLMOnlyDomain = Microsoft Virtual Console Service/*
AllowSavedCredentials = Microsoft Virtual Console Service/*
AllowSavedCredentialsDomain = Microsoft Virtual Console Service/*
AllowSavedCredentialsWhenNTLMOnly = Microsoft Virtual Console Service/*

$keys = "AllowDefaultCredentials","AllowDefaultCredentialsDomain","AllowFreshCredentials","AllowFreshCredentialsDomain","AllowFreshCredentialsWhenNTLMOnly","AllowFreshCredentialsWhenNTLMOnlyDomain","AllowSavedCredentials","AllowSavedCredentialsDomain","AllowSavedCredentialsWhenNTLMOnly"

foreach ($key in $keys) {
    $path = "HKLM:\SYSTEM\CurrentControlSet\Control\Lsa\Credssp\PolicyDefaults\$key"
    $value = (Get-ItemProperty -Path $path -Name "Hyper-V" -ErrorAction SilentlyContinue)."Hyper-V"

    if ($null -ne $value) {
        "$key = $value"
    } else {
        "$key = <not present>"
    }
}