Unable to install WAC in high availability mode

I am getting "access denied" error while running Install-WindowsAdminCenterHA.ps1 as Administrator.

According to installation log, access denied is caused by running this command:

Register-PSSessionConfiguration -Name 'microsoft.sme.credssp' -Path 'C:\Windows\Temp\tmpF49B.pssc' -Force 

I was able to execute this command in powershell myself without any errors,. Also powershell session is registered properly if I run Get-PSSessionConfiguration:

Name : microsoft.sme.credssp
PSVersion : 5.1
StartupScript :
RunAsUser :
Permission : NT AUTHORITY\NETWORK SERVICE AccessAllowed  

Nevertheless nstall-WindowsAdminCenterHA.ps1 still terminates on access denied exception.