1👍
✅
Not that anyone could have specifically known this from my posting…but I would like to post this answer regardless for someone who may have had this same issue.
I have been developing the React Native application via Expo, and deploying it to my physical phone rather than the iOS/Android simulators.
This being the case, clearly my http://127.0.0.1:8000 or http://localhost:etc would not work from my phone! I then switched to using the iOS Simulator and it worked the first try without problem.
Source:stackexchange.com