I have a 2016 535i and it is doing the same thing. If i start one of the music apps (amazon, spotify or iheartradio) before plugging it into the USB port, the music apps will show up. If I just have the BMW Connected App, then the music apps don't show.
I'm planning on stopping by the dealer and talking with one of those BMW Genius people. If I find out anything, I'll post an update.
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