Restore your access to Microsoft Teams (free)
Whenever your access is challenged, Teams will show you a sign-in banner and request that you Sign in to re-authenticate and regain access.
If you see this banner, then this means that Teams will prevent you from receiving new chats or calls, attending meetings or accessing other Teams features until you sign in again. To fix this issue, you can follow these steps:
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Select the banner or the sign-in button in the app. This will open a new window where you can enter your credentials and complete any additional steps, such as multi-factor authentication (MFA).
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If you don't see the sign-in button, check if you have any pending notifications in the system tray (the area near the clock on your taskbar). You may see a Teams icon with a red dot or an exclamation mark. Select it to open the sign-in window.
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If you still don't see the sign-in window, try closing and reopening the Teams app. You can do this by right-clicking on the Teams icon in the system tray and selecting Quit. Then, launch the Teams app.
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After you sign-in successfully, the banner should disappear, and you should be able to use Teams normally. If you see the banner again, repeat the steps above or contact your IT administrator for assistance.
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Make sure you are connected to the network location that your organization requires for accessing Teams. For example, if you need to use a VPN, make sure it is active and stable before you launch Teams.
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Avoid switching between different network locations while using Teams. For example, if you are using a laptop, don't disconnect from your office Wi-Fi and connect to a public Wi-Fi without signing out of Teams first.
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Keep your Teams app updated to the latest version. You can check for updates by selecting your profile picture in the app and choosing Check for updates.