Here are a few possible solutions for troubleshooting notifications for new messages in a Teams chat:

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1. Check notification settings:
   Go to your app’s settings and check to make sure that the appropriate notifications and alerts have been enabled
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2. Check your internet connection:
   Check to make sure that your device is connected to the internet or an available Wi-Fi network
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3. Restart your device:
   Perform a power cycle on your device to restart it and clear any cached data
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4. Update your app and device software:
   Update your app to the latest available version and confirm your device is running the most updated software
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5. Uninstall and reinstall the app:
   If possible, try uninstalling and then reinstalling the app to see if this resolves the issue
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6. Contact Customer Support:
   If none of the above solutions resolve the issue, you may need to contact the app’s customer support team