Thank you for this guide, it helped a lot!!!
But with submission to the MS App Store i got this message here and submission failed:
"App Policies: 10.1.2 Functionality Notes To Developer We have detected that your app is incompatible with Windows 10 S. Please update your app to support Windows 10 S if possible. Otherwise include a prominent statement anywhere in the Metadata that the app does not support Windows 10 S. This issue may affect merchandisability.
Please be sure to test your app for Windows 10 S: Test your Windows app for Windows 10 S - MSIX | Microsoft Docs Tested Devices: Acer Switch 3, High Performance Desktop, Microsoft Surface Laptop
→ i found in your text this here: “Not supported on Windows 10 S” - But where did you tell MS this in the Submission Text “Notes for certification”?
Finally it worked as mentioned above: The “Not supported on Windows 10 S” goes into “Notes for certification” field.