Swiftfin doesn’t do audio for some reason and VLC doesn’t reliably recognize UPmP.
Probably not what you want, but I ended up setting up navidrome and there is a client for tvOS for subsonic.
I was thinking about setting it up. What clients do you recommend for iOS and tvOS?
I don’t use an iOS client, but on tvOS on tvOS I use https://apps.apple.com/us/app/subswift/id6504658929 and it works and is in active development (and is actually pretty new). It’s $5.