Any pnone / network / Upnp guru's here?

[ProDave]

I have a Raspbery Pi Music box as the core of the home audio system, it's main function is to play internet radio stations or play music stored on it's own memory.

It is also capable of streaming music from another device via Upnp Until just now I have not tried this function.

I have installed HiFiCast on my phone. Initially if did not find any "playback devices" to stream to. Help suggested the best place to look was in the router (A BT hub 4) What I found there was Upnp was enabled, but by default "Extended Upnp security"was turned on. I turned that off and now my own phone, an old Samsung Galaxy S3 works, it sees my Music box and streams audio to it.

SWMBO has a new Samsung Galaxy S12 so obviously a newer version of Android than my old phone. I have installed HiFiCast on that as well, but it will not find the Pi Music box.

So my assumption is it must be some android setting that is stopping this which is where my knowledge runs out. Any ideas?

For background the Pi Music box is hard wired via ethernet to the router.