Larix broadcaster - RTMP stream not working over cell phone 4G network

I've setup s couple of cameras to stream to a NGINX RTMP server.
Whenever I use my wifi connection, both cams and streams work fine, but whenever I switch to my cell phone's 4G hotspot, I get "unkown network error".

Anybody got any idea why this could be?

I've verified thst the Larix broadcaster app has access to use both my wifi and cell phone network in the settings of my android phone.

That's a network-related issue which Larix cannot control. There's an option in Advance options called "Don't check network connection" just in case this is some system glitch but that's all we can do from our side.