@tonyApple,
In the test environment: Settings -> Developer -> Local Experiences,
The meta in the site is working, because Smart Banner can launch App Clip card in iOS 14 beta 5,
but in iOS14 release version can not.
(QRCode can launch App clip Card in iOS14 release version)
DerekLin
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Smart App Banner for app clips is still not working on iOS 14 formal release version.