Quick Friday night #selfhosted #homelab help sought, please.

I've got @jellyfin #jellyfin running on a @yunohost server (and generally working pretty well) but I can't see my #DLNA endpoint from it (plugin installed and enabled etc). The endpoint is #GmediaRender on a Nanopi Neo and I can see (and play to) it from BubbleUpnP on my phone.

I think I might have to do some sort of 'hairpin nat' thing with my router, but my network skills are weak.

Can anyone set me in the right direction please?

Am I missing something obvious as to why I can't see my #gmediarender #dlna endpoint from @jellyfin in @yunohost ?

I've added ports 1900 and 7359 to the #yunohost firewall (as per the guidance from the installer) but I can't see the end point.

With #jellyfin on my phone on the same network I can see the version open in the browser in 'play on' but I'm not getting gmediarender (which I have had working really well before).