For Turkey just copy paste the last 17 digits of your IBAN.

It doesn't work on iOS 16.0.3 too

Make sure you have "Sign in with Apple" capability added in release not just debug in Xcode project target.

Should App be uploaded to TestFlight to test the association? I'm working on a new app, created the app on AppStore to get appId but didn't upload any build yet. I can't make it work with Xcode builds deployed to my iPhone. This setting is checked Settings>Developer>Associated Domains and developer mode is used. File validation gives this result: Link to Application | Action required Could not extract required information for application links. Learn how to implement the recommended Universal Links. | Error cannot fetch app site association