Problem port forwarding Milesight camera

I'm trying to port forward my Milesight mini PTZ bullet camera so I can stream to Angelcam.

I'm with Plusnet, and have tried multiple times to open various ports on my hub one router, but they never seem to open. I've raised it with Plusnet, but they told me they don't support port forwarding!

Anyone have any ideas? As I'm tearing my hair out here!