This could potentially be an issue with iPhone X. But it could also be an issue with your wifi or the router/firewall preventing service discovery from working.
I use a command line tool called ios-deploy. Super easy to use. Follow the first two steps of the installation guide (note that you need Homebrew installed):
brew install node
npm install -g ios-deploy
Yes, it could be a problem. I haven’t tried the camera extension on an iPhone X.