Video recording function does not work when using FB browser or when link is shared in Facebook
That is a known issue with FB browsers as they block any in-app video recording using their browser.
These in-app browsers block the WebRTC standard’s ability to gain access to the user’s microphone. WebRTC is the technology used by all video recorders.
So unless the FB browser changes its policy, we wouldn't be able to do much on this front. This is going to be the case with any Video Testimonial Service provider, not just SocialPrf as far as we are aware.
The only workaround is for users at this point is to click, open in chrome and record videos.