I know this is an old post, but the issue still exists. I have an iPhone 6 plus running ios 10 (I keep up with the latest software updates). I have found an intersting workaround for this issue: Siri seems to work better if you seem angry. For example, the response to "Open Spotify" is: "Sorry, I can't do that because I can't find 'music' on your iPhone. But you can restore it from the App Store." (I have the music app disabled on my phone)
Interestingly, Siri responds to my request if I say: "Open the f***ing spotify app". I know it sounds strange, but it works. Occationally, this doesen't work, so I have to come up with more ways to tell siri to open spotify using explicit language. This is a serious antitrust issue that spotify should pursue. If anyone else is having this issue, try explicit language or a more angry tone of voice. It usually works for me
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