The app opens, please go to Step 1
The app does not open and there is no banner and you see URL not found, go to Step 2.
The app does not open and if there is a banner and you see URL not found, please go to Step 3.
Team ID differs from App Prefix and entered for the Team ID.
App bundle has been set up in differently in the the dashboard to the one you are using when using debug version of the app.
Associated domains not properly set up in developer portal / Xcode. Ask the client to share a screenshot of the associated domains
Testing Universal links on iOS 8 and lower, where it's not supposed to work