minispy - Windows cannot verify the digital signature for this file

I have built the Microsoft sample minispy minifilter with no issue. I made sure that since I am using 64-bit, I have also compiled in x64 on my Visual Studio. Tried both Debug and Release. Hence in terms of coding, it should be correctly done, hence this is not a programming question.

A digital certificate is required. Here is a screen shot to show that it was correctly installed: Click here for screen shot of digital certificate status being OK

I later installed minispy using the .inf file (.sys and .exe files in the same folder as .inf, got this from here). The first problem (and I suspect it is the main problem) then shows in this screen shot: Click here for screen shot of digitally unsigned driver error

If you are not able to see the screen shot, it says:

A digitally signed driver is required
Minispy Filter Driver
Windows (R) Win 7 DDK provider
Windows blocked the installation of a digitally unsigned driver. Uninstall the program or device that uses the driver and check the publisher's website for a digitally signed version of the driver.

This is despite having the certificate already properly installed as shown above. Note that I am using Administrator privileges. I am also running on an AWS EC2 instance, in which I cannot reboot and hit F8 to disable digital signature, and check if this is a signed driver issue (as explained here: Windows cannot verify the digital signature for the drivers required for this device). If it helps to know, my machine is running on Windows Server 2016.

When I had come to the part about loading the service, here is what I saw on the console after I entered the following command line:

fltmc load minispy

Load failed with error: 0x80070241
Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source.

net start minispy

System error 577 has occurred.
Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source.

I've tried several times and having researched for a couple of hours - can't seem to find specific steps in installing and setting up minispy, I wonder why. And while my issue is specific to the minispy minifilter, I think this is really more about the system and about installing drivers. Would really appreciate any help on where I might have gone wrong, and how I may resolve this.

Couldn't find a solution so the workaround I did was to disable the following:

1. Program Compatibility Assistant: https://winhelp.co/knowledge-base/windows-10-disable-program-compatibility-assistant-2/
2. Driver signature enforcement: https://windowsreport.com/driver-signature-enforcement-windows-10/ (I haven't tried this again on an AWS EC2 instance, but on my own laptop instead)

Like I said, it is a workaround. If anyone has a real solution, I'd be most delighted to hear how.

After this, I am now able to install the minispy.inf and run minispy.exe.