Hello @youki , Welcome to Microsoft Q&A!
Do you use Github as CDN for publishing your app on the MS Store?
GitHub is not a CDN. According to official documentation, you must use versioned secure URL pointing to app package (MSI/EXE) hosted on your CDN. You need to follow good CDN practices and ensure that this URL is performant, reliable, and available based on your market selection, it is advisable to use your own server or a dedicated CDN provider.
Thank you.
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