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App Help

Duo

Use this for Duo Mobile push notifications, new-phone reactivation, multi-factor sign-in help, and Duo push or passcode issues.

Reviewed April 2026

Applications

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Application

Duo Mobile

Mobile multi-factor authentication app used for Duo-protected sign-ins, push approvals, and time-based passcodes.

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Vendor help

Duo

Overview

Duo issues are usually push notifications not arriving on the phone, a user who switched phones without reactivating Duo, or a sign-in prompt not offering the expected Duo method.

In scope

  • Duo Mobile

Start here

Helpful starting points

Shared notes

  • If push is not arriving, confirm the phone has internet, notifications are enabled for Duo Mobile, and time is set automatically.
  • If the user replaced their phone, Duo needs to be reactivated on the new phone through the company process or the Duo Self-Service portal.
  • Backup passcodes are a useful fallback when push is not working; keep the user's environment in scope before blaming the app.

FAQ

  • No vendor-specific FAQ is captured yet. Use the shared notes and application guides as the first-pass reference.

Common problems

Recurring vendor-wide problems

Usage issues

  • If push is not arriving, confirm the phone has internet, notifications are enabled for Duo Mobile, and time is set automatically.
  • If the user replaced their phone, Duo needs to be reactivated on the new phone through the company process or the Duo Self-Service portal.
  • Backup passcodes are a useful fallback when push is not working; keep the user's environment in scope before blaming the app.

Setup / update tips

  • If push is not arriving, confirm the phone has internet, notifications are enabled for Duo Mobile, and time is set automatically.
  • If the user replaced their phone, Duo needs to be reactivated on the new phone through the company process or the Duo Self-Service portal.
  • Backup passcodes are a useful fallback when push is not working; keep the user's environment in scope before blaming the app.

Access

Accounts, setup, and official tools

Account and setup pages

  • Duo support team Panel for users, phones, policies, and bypass codes
  • Duo Self-Service portal if enabled by the company
  • Company company sign-in page that sends users to Duo for multi-factor sign-in