Thanks! Yeah, saw there was a yt plugin but not for ytm. The plugin for ma is also a bit flaky and auths via cookies, so not proper auth.
I’ve subbed to Spotify and it works like a charm. Can select Snapcast directly from any Spotify app and then it plays on all snapclient speakers in sync.
Yeah I don’t want to use another app. Therefore I’ve subbed to Spotify premium and that works perfectly with Snapcast. Can use the Spotify app to play to all snapclient speakers.