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Are you saying that your mobile doesn't see the speaker when you follow these instructions? Do you have a Premium account?
So when a song is playing on spotify android and you tap the Now Playing bar, does DEVICES AVAILABLE show at the bottom of the screen?
Ah thanks. You can get in touch with spotify direct here but it might be worth downloading sony's firmware update for the speaker if you haven't already done so.
There's no email support but you can use the contact form or twitter as detailed on that page.