Test system is not shown in HLK controller

I have 2 Windows 2016 server VM,

I have installed HLK Controller in 1 VM as told in the docs Step 1https://docs.microsoft.com/en-us/windows-hardware/test/hlk/getstarted/step-1-install-controller-and-studio-on-the-test-server

I installed HLK Client on second VM as shown in Step 2 of the same doc above

But when i open HLK Studio in VM 1 I am not able to see VM 2 as test server in Configuration of HLK Studio.

Please help me resolve this , I have tried everything told in troubleshoot doc nothing worked for me

Thanks in advance