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When the result of authenticator.GetUI () is displayed and the user authenticates, the label "Returning to your application" is displayed like before, but unlike before, it now redirects to some Twitter screen instead, and OAuth1Authenticator.Completed is not raised. The only way to get out of that screen is clicking "Cancel" at the top which finally raises Completed but with no e.Account and with e.IsAuthenticated false.
Same with Xamarin.Auth for Android.
Created attachment 12074 [details]
A test case for the bug on Android
The problem was that Twitter created a new domain for mobile web, mobile.twitter.com, so I my callback URL of twitter.com no longer worked. So there's actually no bug, please close this as invalid.
Server side API changed for Twitter