Are you just trying to record audio or facetime? I never tried either so I can't be of any help. I have one of the 3rd party phone conversation recorders installed but to be honest, I never thought to use it.
I was only hoping for it to record a FaceTime call but didn't care about the video as much as the audio. But I did some research and the screen recording is suspended for all calls according to a few websites, and is what I saw also.
Now here's my review:
I have always liked the idea of the Apple Watch, but didn't care for the previous implementations. I thought this newest version would be the cat's meow with the LTE calling and so forth. Which leads me to my first screwup! I ordered the wrong damned watch! Got the GPS version and everything Watch at Apple has a 3-4 week+ shipping time!
After installing a few apps and playing around a bit, I still love the ideas presented. But my poor old eyes don't like the small screen much at all. I can read the bigger stuff without my reading specs, but the smaller stuff just is fuzzy and not useful. Not the fault of the watch, just a fact of my aging process.
I got the watch to use on the golf course as primary usage. Loaded two of the golf GPS apps on and while they work, they both offer very simplistic layouts due to the real estate restrictions of the screen. One of them wouldn't even work unless you upgrade ($) to one of the non-free versions. Both do what they do quite well, but are very limited in scope. One biggie is no presentation of the hole layout, neither as a made up picture nor as a satellite image. That is important. And what it means, is that even though the apps work and provide some info about the hole that is useful, you still need the phone using the same app being in range of the watch. Pretty much precludes the idea of only taking the watch on the course.
Because of that the most likely scenario is that I will send the watch back to Apple. Or less likely just keep the GPS version because the LTE version brings nothing to the table that I would need. I'm disappointed to say the least.
edit: put this in the wrong thread!