DNS search issue?

I am using a Windows machine and I have set the Allow DNS enabled on my ZT app however the issue is, the DNS search suffix doesn’t seemed to be added every time I ping or access something.

For instance, I can ping test01.testdomain.mgmt.net.au but I cannot ping if I just put test01.testdomain. My understanding is that if we put DNS domain testdomain.mgmt.net.au in ZT portal, every client should auto add that on every DNS query.