I think the main problem is that Universal Links doesn't work with redirects, they work only when there has been a user interaction, meaning a user tapped on a link. That's a big problem for OAuth authentication. The only solution I can think about is on the landing page add a successful page with a link that opens the app.Hope I'm wrong and there's a better workaround...
michaeljck8
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Copy the needed OS version from a newer Xcode, not from Github!