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Ensure proper internet speed. Recommended is 3Mbps. You may verify your speed here: https://speedtest.net.
Review your system requirements. You can find them here.
Validate your webcam is working, microphone, and audio. Verify how to test these devices here.
Last minute checklist
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Turn off all notifications from your phone, email, and messenger application.
Ensure your computer or laptop is properly connected and is fully charged.
Close all applications and disable notifications.
Have a valid ID document readily available.