React Native Android Fetch failing on connection to local API

I'm using the fetch API in my react-native Android app to make requests to a local API. I usually query said API from react web apps at http://localhost:8163.

I'm testing my app on my physical device in debugger mode. I read somewhere that react-native can't query localhost the same way a web app can. Apparently you have to use http://10.0.2.2:[PORT_NUMBER_HERE]/ which is an alias for `http://127.0.0.1:[PORT_NUMBER_HERE] according to the the Android emulator docks. I'm not sure if this is what I'm supposed to be doing for testing on a physical device.

My fetch code looks like the following:

fetchToken() {    fetch('http://10.0.2.2:8163/extension/auth', {        method: 'GET',        headers: {'Accept': 'application/json','Content-type': 'application/json'        }    })    .then((response)) => console.log('successful fetchToken response: ', response.json()))    .catch((error) => console.log('fetchToken error: ', error))    .done();}

The request always hangs for a while and then reaches the catch block with the unhelpful error TypeError: Network request failed(...). Checking the logs for my local API, they don't register the request at all.

So I have no idea if I'm querying my local API correctly to get the resource that I want, and if I am, I don't know why the fetch is failing.