Invoke-Command RDS, deployment does not exist

Hello,

 I am trying to invoke simple commands(like get-rdusersession) on RDS server from another server in domain. But I always get an error that the deployment does not exist on that server. Which is not true because deployment definetly exists on RD server(its just one server with broker, host, web..) and also I CAN manage it in Server Manager from the same server from which Iam trying to run the command. In SM I can see the deployment, collection, logged users... I have also updated to PS4 but nothing changed

 Someone has a clue whats going on? Thank you.

Pete

sfs