I encountered the same problem as you. I'm a new developer and my first app was released in the app store about 16 hours ago. Similarly, my App clips did not take effect, then I go to Settings->Developer->APP CLIPS TESTING->Diagnostics, and fill in the domain name of appclips. The result I get is as follows: Apparently, it informed me that my App cClips were not published in the app store and my domain name was not associated. I double check the app clips distribution policy distributing-your-app-clip, At the same time, I go to appconnect to check app clips settings and domain name status. I didn't find anything wrong. Is it because app clips are deployed much later than full app or is there something wrong with my settings?

I also checked the cache of Apple CDN for my apple-app-site-association. https://app-site-association.cdn-apple.com/a/v1/mydomain.com. It is normal too.

How long does it usually take for App clips to take effect, after the full app is released on the App Store? My full app has been available for a day on app store, but the Diagnostics shows that the app clips have not been published on the app store.

I also encountered the same problem!

Advanced App Clip Experiences status

Finally, my Advanced App Clip Experiences are working (at least in my country and region), I don’t know if it’s because of Apple’s handling of this bug, or because of some actions on my part. I performed a version update yesterday and address Apple reviewers about the problems with my Advanced App Clip Experiences in App Review Information. Below are screenshots of my current Diagnostics results and Advanced App Clip Experiences status. As you can see, the status of my Advanced App Clip Experiences is still "Received". I am not sure if it is because my new version App has not yet taken effect in all countries and regions. If there is any change in the status later, I will report it in Post a comment. This post is mainly for those friends who have encountered the same problem as me. If it's not an Apple problem, it's probably answered like this link below. Gone through a full cycle of App Review before our Advanced App Clip Experiences will take effect. https://stackoverflow.com/questions/67922190/ios-appclip-status-received

By the way, let me give you some tips on debugging. When you Diagnostics, you must fill in the domain name + prefix in your app clip, not just the domain name. For example, "render.alipay.com" is the domain, it is App Clip url is "http://render.alipay.com/p/s/ulink/", when you Diagnostics this url you will get the answer(It doesn't set Smart App Banner). If you only Diagnostics domain names "https://render.alipay.com", you got nothing correct. How to determine whether your App Clip is successfully released in App store? First we have to distinguish what is App Clip, Default App Clip Experiences and Advanced App Clip Experiences. When you successfully listed your App that containing an App Clip you can bring up your App Clip through Default App Clip Experiences. The method is to set up Smart App banner on the website. Tutorial Only after you have eliminated all issues, then you can determine whether Advanced App Clip Experiences is not taking effect and remind Apple’s reviewers the next time the app version is updated.