Chromecast audio start playing from spotify

Did anybody succesfully start casting spotify music to chromecast audio?
I failed to find a way to do this. I need to start the cast from my phone first, I really like to be able to do it direct.
Any comments are welcome

Unfortunately I was not successful either.
I did try it with using the playSound() command and the URL of the Playlist, but the authentication part is missing I guess.

So if someone has an idea I would be happy to try out as well.

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