HEOS and Spotify connect work well right now, but Daily Mixes don't.
When you try to play from Daily Mixes this is simply ignored if you are using HEOS.
If you are playing another song and you click Play on Daily Mixes, the song that you were playing simply continue.
If you are not playing aanything, nothing happens.
I tested this from my Android and my iPad, same behaviour.
If I am using headphones instead of HEOS output, Daily Mixes works just perfectly