I am trying to run a multiple physical iOS devices on Appium but it keeps crashing / not connecting

I set up 2 different servers at first and tried running with different ports – that led to crashes and scripts stopped mid way.

I understand it has to do with the WebDriver needing to run on a different port, as it’s already taken, the other server is trying to make a request and the socket refuses connection and it crashes.

I tried running

appium server --driver-xcuitest-webdriveragent-port 810x

but now it won’t connection was refused to port 810x, socket hang up. can someone help me please?