Hii… I have used the babylon react native sample project GitHub - BabylonJS/BabylonReactNativeSample change typescript to JS. In that I just changed the 3d Modal URL from Firebase but it shows some error in my mobile(Screenshots attached below).
I will take the BabylonReactNativeSample change it to Javascript and see if I can repro your issue. Your URL seems to be fine. I was able to load the scene using the Playground with no problem. If you just create a static scene, with a plane and s sphere, do you get this error? (Just want to double check if it is not an issue from changing the project to Typescript to Javascript).
By changing the LoadAsync to Load (and giving it a onSuccess callback) you should be able to get the actual error. It seems the request if failing for some reason, maybe XMLHttpRequest implementation in the browser has features that the React Native implementation do not have.