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If the user has an app installed that has a Universal Link registered
for the authorization endpoint, then launching that app will provide a
better user experience.
If the launch fails, we continue as before to use an in-app browser
tab etc.
See this OpenID Foundation blog post for further details:
https://openid.net/2019/10/21/guest-blog-implementing-app-to-app-authorisation-in-oauth2-openid-connect/
There was a question about whether to make this the default behaviour
or not; the documentation for OIDExternalUserAgentIOS says:
so I think it's consistent with the documented goal to enable app2app
by default.