Can reproduce
CR - as described, the first attempt brings up a second modal - which if you provide a new Authenticator code, it will remove app auth. First code just gets swallowed - Version 1.0.0, Beta 60, Channel Beta, Build 67, iOS 26.6 (arm64), Device iPhone13,1, Locale en-GB, Push apns, Flutter 3.47.2, Dart 3.13.2
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Comment by bizo