Outlook sofware on cell phone will not load; cannot send or receive

Leonard Komen 0 Reputation points
2026-10-07T23:13:37.6133333+00:00

I exchanged my broken cell phone for a replacement and transferred all softwar, apps and date.

Now, the Outlook app will not open and the message is: : "an error occurred during authentication

Outlook | Outlook for mobile | Outlook for Android | For home
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  1. AI answer

    2026-10-07T23:13:51.8466667+00:00

    After a phone replacement and app/data transfer, this is commonly an authentication or cached app-state issue on Outlook for Android.

    Try these steps in order:

    1. Clear Outlook cache
      Go to Settings > Apps > Outlook > Storage > Clear cache.
    2. Force stop Outlook
      Go to Settings > Apps > Outlook > Force stop.
    3. Restart the phone
      Then open Outlook again.
    4. Update Outlook
      Install the latest Outlook version from the Google Play Store.
    5. If the issue started after moving to the new phone, reinstall Outlook
      Uninstall Outlook, restart the device, then install Outlook again and sign in fresh.
    6. If Microsoft Authenticator or Company Portal is installed, check Android power settings
      On some Android devices, Outlook sign-in or sync can fail if Android blocks Authenticator or Company Portal from launching or running in the background.
      • Turn off power-saving mode.
      • Allow the app to launch other apps.
      • Disable power optimization for Authenticator/Company Portal.
      • Open Authenticator/Company Portal first, then open Outlook.
      • On Huawei, this setting is in Phone Manager > Auto-launch > Secondary launch management > Enable Authenticator/Company Portal.
    7. If the account is a work or school Microsoft 365 account
      Contact the Microsoft 365 admin or technical support if Outlook still cannot sign in.

    If Outlook shows Access Denied: Login Error, the account has been denied access to Outlook Mobile and must be handled by the IT administrator.

    AI-generated content may be incorrect. Read our transparency notes for more information.

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  2. Manoel Barros 22,245 Reputation points Independent Advisor
    2026-10-07T23:50:43.4266667+00:00

    Hi!

    Did the message appear after you tried to log in with your account, or did the error show up as soon as you downloaded, installed, and opened the app?

    Do other Microsoft apps work, such as OneDrive, Word, or Excel?

    Have you fully updated your phone? It is important to keep your phone updated to avoid bugs.

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