Cannot set Autodiscover internal URL

Hello

On cas server powershell i am trying to set Autodiscover internal URL with command:

Set-ClientAccessServer -Identity CasServer1 -AutoDiscoverServiceInternalUri https://mail.domain.com/Autodiscover/Autodiscover.xml

Command runs with no problem - no errors are produced.

But when i run following command after: Get-AutodiscoverVirtualDirectory

I see that InternalUrl column is empty... how is that?