Why doesn't all UPnP ports work

Reliance Jio150Mbps
I want to access my raspberry pi outside my house ports are 80 are 8096, but if I use UPnP to port forward(there is a command-line tool called miniupnp that I used to manually change it) or even port forward the normal was but the interesting thing is that my Plex can be accessed outside my local network. Please help me. My router is Jio square white-colored router(JCO500). If anyone knows how to port forward on this router can you please tell me?
Port forward does not work with jio because of CGNAT.
The reason plex is working is that, it currently supports relaying which is turned on by default on the server side.
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