App Clip show "App Clip Unavailable" only when the main app is not installed

After uploading the app to App Store Connect, Apple automatically generated a Default App Clip Link. However, the App Clip card only opens successfully if the main app is already installed on the device. If the main app is not installed, the App Clip card displays an image and the message "App Clip Unavailable"

What could cause this behavior, and how do I ensure the App Clip works without requiring the main app to be installed?

For troubleshooting information, see TN3168: Making your App Clip available in the App Store.

App Clip show "App Clip Unavailable" only when the main app is not installed
 
 
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