Scanning an AppClip link shows "AppClip unavailable"

We're using AppClips as an important part of our business. Since a few hours scanning the URL assigned to our AppClip shows "AppClip unavailable" instead of the advanced experience!

What can we check or do to fix this issue?! We checked Apples AASA CDN and our AASA file and everything is correct.

Also, why is this error sheet not showing a link to open the website as it does on older iOSes:

Scanning an AppClip link shows "AppClip unavailable"
 
 
Q