Good day raymondzeno! I am Independent Advisor Paul R. and also a Microsoft/Windows user like you and I am glad to be able to provide assistance to you today. I understand that you are looking into getting a mirror image on webcam.
You can refer to the link below in which a tweak was suggested by RichardKerhin1 and you can try it out.
https://answers.microsoft.com/xx-xx/windows/for...
In the event that the above tweak will not work for you then you can also consider installing 3rd party apps as the built-in camera app has limited features and you can check out the link below for alternatives.
https://filmora.wondershare.com/live-streaming/...
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Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
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Regards,
Paul R.