Can't sign in to the Outlook mobile app

Try these steps in order to troubleshoot sign-in issues with the Outlook mobile app:

1. Confirm the type of account being used
   • If it is a Microsoft personal account (Outlook.com, Hotmail, Live, MSN), run the sign-in helper tool, which checks the account and guides through fixes: Start.
   • If it is a work or school account (Microsoft 365), use the self-service password reset page if enabled by the admin: Reset password. Otherwise, contact the organization’s IT admin.
   • If it is a non-Microsoft account (Gmail, Yahoo, iCloud, etc.), contact that email provider for sign-in issues.
2. Make sure the Outlook app is up to date
   • Recurring or unexpected sign-in errors can occur if the app does not meet current security standards. Install or update to the latest Outlook for iOS from the Apple App Store: download the latest version.
3. Verify username and password outside the app
   • Open a browser on the device and sign in to the same account (for Microsoft 365 or Outlook.com) to confirm the username and password work correctly.
   • If sign-in fails in the browser as well, resolve that issue first using the sign-in helper or password reset links above.
4. Check for account blocks or access restrictions
   • If the account is a work or school account and access to Outlook mobile has been blocked by policy, the sign-in will fail. In that case, only the IT administrator can unblock or allow the account to use Outlook for iOS.
5. If still unable to sign in
   • For Microsoft personal accounts, use the sign-in helper again and follow any remediation steps it provides.
   • For work or school accounts, contact the IT administrator and provide the error details from the app so they can check account status and policies.

References:

• Can't sign in to the Outlook mobile app
• What you can do in the Microsoft 365 apps on mobile devices with a Microsoft 365 subscription
• Access Denied: Login Error
• Get help with Outlook Lite for Android