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Make sure you log out from both apps and reinstall them. To remove any old app data and start afresh with the latest Spotify version follow the steps for a clean reinstall described here.
Once you've performed the clean reinstall, log back in to both apps and try connecting them. In case the Facebook library still comes up, send us a screenshot of how this looks on your end. You can attach the image to your next response to us by using the Insert Photos option in the post editor. This way we can take a closer look at the issue.
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“Music is the strongest form of magic.” Marilyn Manson