HCK test "callback test for object Win7" is failing while running HCK test for signing our Drivers

Running HCK tests on our Software driver files to obtain Microsoft Signed certificates for our drivers to run on Windows 7 machine.
HCK Controller/Server : Windows 2008 R2 Server
HCK Client: Windows 7 Pro

Out of 27 HCK tests, only one test is failing i.e. “callback test for object Win7” and in the logs its showing as:
https://ibb.co/z54XRNz

Can anyone please help on what is the exact cause for this test to fail?