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We couldn't authenticate you. This could be due to a device or network problem, or Teams could be experiencing a technical issue.

Imran 0 Reputation points
2026-06-19T11:05:36.5333333+00:00

We are getting this message. We couldn't authenticate you. This could be due to a device or network problem, or Teams could be experiencing a technical issue. how to solve it

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  1. Rin-L 21,440 Reputation points Microsoft External Staff Moderator
    2026-06-19T12:25:20.3533333+00:00

    Hi @Imran,

    To better understand the scenario and help narrow down the root cause, I’d like to clarify a few points with you: 

    • Are you running into any authentication issues, such as an incorrect password or MFA not completing successfully?
    • Could you please confirm if this is happening on the Teams desktop app? If yes, it would be really helpful if you could try signing in to Teams via the web and see whether the same error appears there as well.
    • Also, is this issue happening only to one user or to multiple people? If possible, try signing in with the affected account on a different device to see if the behavior is the same.

    In the meantime, if you're seeing this mainly on the desktop app and using Windows OS, there are a few things you can try:

    • Make sure your PC date and time are correct, your internet connection is stable, and that no proxy, VPN, or firewall is blocking Teams authentication.
    • Clear the Teams cache by following this guide: Clear the Teams client cache - Microsoft Teams | Microsoft Learn
    • Clear Windows Credentials by going to: Control Panel > User Accounts > Credential Manager > Windows Credentials. Then remove any entries related to Microsoft Office or your account.

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    • Re-add your account by navigating to: Settings > Accounts > Access work or school. Disconnect your account, then restart you computer add it back again afterward.

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    Whenever you have time, feel free to share what you observe after trying these steps and the answers to the questions above. Your answers will help me understand your situation more clearly and gather the right information to support your case. 

    Thank you for your understanding, and I look forward to hearing from you! 

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.  

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  2. AI answer

    2026-06-19T11:05:51.9133333+00:00

    The message indicates Teams cannot complete authentication, usually due to network, device, or sign‑in configuration issues. Use these steps in order:

    1. Restore access in the Teams client
      • In Teams, select the Sign in banner or button.
      • In the window that opens, enter the work or school account and complete all prompts (including multi‑factor authentication with Microsoft Authenticator, SMS, or phone call).
      • If the sign‑in window does not appear:
        • On Windows, check the notification area near the clock for the Teams icon with a dot or exclamation mark and select it.
        • If it still does not open, right‑click the Teams icon in the notification area, select Quit, then reopen Teams and try again.
    2. Check required network/VPN and connectivity
      • Connect to the network required by the organization (for example, connect to the corporate VPN) before opening Teams.
      • Make sure the device has a working internet connection.
      • Avoid switching between networks (office Wi‑Fi → public Wi‑Fi, or Wi‑Fi → mobile hotspot) while Teams is running. If a network change is needed, sign out of Teams first, switch networks, then sign back in.
    3. Fix common Microsoft Authenticator issues (if MFA is used) If the sign‑in flow shows “Authentication did not complete” or MFA prompts fail:
      • Ensure the Microsoft Authenticator app is unlocked on the phone.
      • Turn on notifications for Microsoft Authenticator and make sure they are not silenced.
      • Confirm the device has internet access; if needed, switch between Wi‑Fi and mobile data and retry.
      • Make sure the device’s date and time are set correctly (automatic time is recommended).
      • Ensure the latest version of Microsoft Authenticator is installed.
    4. Try alternative access paths
      • If using the desktop or mobile app, try signing in via the web: https://teams.microsoft.com/.
      • If using Teams on the web and it fails, try the desktop app or another browser and temporarily disable ad blockers.
    5. If the problem persists
      • If a specific error/status code appears in the lower‑left corner of the Teams sign‑in window, note it and provide it to the IT administrator. Many sign‑in issues (for example, Entra ID policy, conditional access, or tenant‑level blocks) can only be fixed by the organization’s admin.
      • If there is no specific code and all steps above fail, contact the IT administrator to check for:
        • Conditional access or device compliance policies blocking the device.
        • Tenant‑wide issues or service incidents.
    6. Temporary or service‑side issues
      • In some cases, tenant or service issues can cause temporary sign‑in failures. If everything is configured correctly and other users are also affected, wait a short period and try again, and have the admin check Microsoft 365 service health.

    References:

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