Rdp for mac stopped working windows update may 2018. Try to connect the remote system with IP address other than hostname and see the result. Firstly see you have port 3389 (RDP Port) open for proper connection, as might it blocked by firewall.
› ▀ ▀ ▀ Model 2 Emulator Macįor remote session to connect successfully there is some points which need to be clear.