Hi William,
I tested MusicBee on my PC, and I had the same issue with you.
I joint MusicBee forums and asked for help, but unfortunately I was told that Steven, who is the author of MusicBee and the UPnP plug-in, he stopped maintaining the plug-in since 2021. So no one can provide tech support to me.
Will you consider to use MinimServer as your UPnP server instead?
I tested MusicBee on my PC, and I had the same issue with you.
I joint MusicBee forums and asked for help, but unfortunately I was told that Steven, who is the author of MusicBee and the UPnP plug-in, he stopped maintaining the plug-in since 2021. So no one can provide tech support to me.
Will you consider to use MinimServer as your UPnP server instead?