By investigating the network, I can see that all the devices are requesting spotify-connect._tcp.local via mDNS/5353 and getting no reply. I have seen many posts suggesting to map port 5353/udp to the container but as far as I can tell, no process actually *binds* to this port (and I checked that it is free and not already used by another host process or container). Anyway, port is mapped and it doesn't help.
It's my understanding that the helpers would not "bind" to that port but listen to UDP broadcasts on that port. And those broadcasts don't make it through to the container. From what I understand most solved this problem using Docker's host mode networking.
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