For anyone who comes across this thread, It seems the issue is related to using App Clips with unlisted apps. We submitted a separate, publicly listed version of the app, and the App Clip now works perfectly (even on iOS 26 devices). You can find a similar discussion here

@pumpkinpaul Hello, and thank you for your response. To clarify our issue, the "Received" status for our advanced experience has not changed since its creation. Upon inspecting the JSON data, we observed that the actual status is "CREATE_SUBMITTED", which appears to be the same problem you've reported in this post here: https://developer.apple.com/forums/thread/810544 For your reference, here is another developer forum discussion that highlights similar issues and suggests using Feedback Assistant: https://developer.apple.com/forums/thread/773418 We appreciate any further insights or suggestions you might have. Thank you.

@DTS Engineer Sorry to bother you again, but could I ask one more quick question? I'm curious about the "Background App Refresh" setting. Does it also apply to App Clips? For example, if I turn off this setting, will an App Clip remain on an older version even after a new version is published? I'm trying to understand the scenarios where an App Clip might not update, so I can test those use cases. Thanks again!

@DTS Engineer Thank you for the quick and clear response! Just to confirm my understanding: an existing App Clip on a user's iPhone will be automatically replaced by the system with the newly published version, much like a background app update, Is that correct? Thanks again for your help!