Hi Bobby,
There might have been some changes that occurred on your computer without your knowledge reason for the error message "Camera not available" to show up. However, we appreciate the time that you've looked for solution on a Microsoft support page. Upon checking the article regarding your concern, it also says there to "Checked for an outdated webcam driver, Roll back, and **Uninstall your webcam driver and scan for hardware changes"**if checking the antivirus settings didn't work. If you've tried the other steps provided in the article, may we know the results?
We're looking forward to your response.