Help YT MUsic doesn't find audio chromecast

[deltaforce]

I just got a new Chromecast Audio. It works flawlessly with TuneIn Radio. No hassle whatsoever. When I fired up YT Music, it keps searching 'nearby devices' forever. I rebooted phone and Chromecast audio. Nothing changes.

Anyone know what the heck is going on.
Its on Galaxy S4 Play Edition, Android 5.0, rooted

Thanks in advance.