Uploading .hlkx file returns "One or more errors occurred."

I am attempting to upload our first hardware driver submission, but get the crpytic "One or more errors occurred."

So unsure how to proceed with this.

I am sure I will have to give more information on the submisson.

I had considered it was an issue with signing the submission. I am using a new EV certificate that is stored in Azure Key Vault HSM - and there is no official process for signing the submission.

I have used this tool. as the author suggested this has been successfully used, https://github.com/monrapps/OpenOpcSignTool

I am also trying to submit a driver that is based on https://github.com/microsoft/Windows-driver-samples/tree/main/simbatt

For Windows 11, the playlist only offered a few tests.

For Windows 10, the playlist didn't offer any tests.

All offered tests passed. And I follow all the guidance to create the submission.

I have tried just the Windows 11 results, and the merged package for Windows 10 and 11.

I am also mindful, my test VMs are IoT Enterprise LTSC images - as this is my target platform - and it may be this, and I need to test with specific OS images.

Without any better understanding of what the upload error is, I am unsure how to proceed.

I had opened a "generic" developer support ticket. The reply was I needed to contact HLK Support - but that gets confusing in the support options, and getting pushed requiring paid support.

Hence turning to the community first, to get so idea if\how to go about understanding the issue and getting it resolved.