Hi,
you may take a look on fixed and known issues here:
https://learn.microsoft.com/en-ie/windows-hardware/test/hlk/what-s-new-in-the-hardware-lab-kit
You may also export the failing job to your test client and run it locally to get more info:
https://learn.microsoft.com/en-ie/windows-hardware/test/hlk/user/exporting-a-failed-hlk-job
Hope this helps.