Run the check
Check this site's camera permission and retry the webcam test after allowing it.
Check the browser's camera defaults and selected device.
Check OS camera privacy access, then restart the browser if the system requests it.
Official reference: Chrome camera and microphone permissions
Read the result
A permission error is different from a frozen preview or a camera occupied by another app.
Limits and next step
Managed browser policies may prevent changes; the page cannot override them.
Repeat the check after changing one setting or connection. Keep a record of what changed before deciding whether the device needs service.