How can I debug universal link not opening my app?

I've set up my apple-app-site-association file correctly under (e.g.) https://www.myapp.app/.well-known/apple-app-site-association. I've added associated domains entitlement and confirmed it exists in the IPA. [TEAMID].applinks:*.myapp.app and [TEAMID].applinks:www.myapp.app

And still, after deleting and install my app won't open or respond. Just the website. How can I debug this further?