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I’m here to help you in resolving your issue
By default Windows Defender should automatically fetch updates through Windows Update. However, you can verify the settings to make sure they are enabled using below steps :
1: Press Win +S , type " Windows Security" , open it.
2: Go to "Virus & Threat Protection", Under Virus & Threat Protection Settings, click Manage settings.
3: Ensure to Turn on " Real-time Protection", "Cloud delivered protectionn", "Automatic sample submission".
4: Go back and Under Virus & Threat Protection, click on Protection updates and click on Check for updates for latest updates to be installed.
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After trying above steps, please reach out to me if you have any doubts or issues
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