Thank you Jason for your reply, that’s what it happens to me and for this reason I thought the entitlement doesn’t have to go in that file..

I created it manually to try if that solved the issue - it didn't. What I have tried now is to Archive the project with Xcode 12.4 and that has worked. I have successfully opened the App Clip from TestFlight. I assume it's a bug in Xcode 12.5 beta 3 (at least) and if that's the case I hope it gets fixed in the next release!

I will let you know if I can open it in another device (in an hour, maybe). I’ve just created my first App Clip yesterday, in 12.5 beta 3, so I didn’t know what I was doing wrong. I tried different things for 2 hours and decided to ask here and go to sleep :)

I've successfully tried both my app and my App Clip in my brother's iPhone (he's not a developer). Also a friend who test this app tells me he also can open it. It's strange.. I think I should have to archive the app from Xcode 12.4 from now.. 🤷‍♂️

When does the error appear? When you open your App Clip through the TestFlight app or when you try to scan an App Clip code or an NFC card? I think you need to have an already published version of the App Clip on the App Store to be able to use App Clip Experiences.. (I'm not sure, though). If you don't need to have a published App Clip, then I have the same problem as you. Maybe tomorrow I'll publish the first version to the App Store. I'll check then what happens when I scan an App Clip code and write a reply on this page.

Looks like embedding without signing the WidgetKit.framework in the widgetExtension allows me to run the widgets on iOS 15

Hello! I've also been struggling to upload a new build. About an hour ago, Apple recognised that there is an outage affecting some services. https://developer.apple.com/system-status/