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Some Duo Mobile authentications may fail on older or unsupported devices due to expired security certificates. This article explains who is affected and what steps to take to restore access.

Duo Mobile requires supported versions of iOS and Android to maintain security and reliability. As of April 16, 2026, Duo Mobile will no longer support iOS 16 or Android 11. Users should update their mobile devices to iOS 17 or Android 12 (or newer) to continue receiving security updates and full support.