From @ocharifaDear
Azure Team, thank you its worked and connected now, but please tell me how can I join my computer to the Azure domain controller? I have tried all the name that I have for joining domain but nothing worked. please advise.
Also the client computer which I want to join it to the domain connected to VPN (Point to site) and pinging to 10.0.1.4
From,
@AzureSupport