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I got this answer from HK today:
Please note that the HK Home Wireless series has never been marketed as being, or becoming, compatible with Spotify Connect. What may have happened is that some stores, and possibly some Harman customer support output has indicated that this would be possible. It is being worked upon, but there are issues that may not be possible to solve. While it is of course always possible to stream Spotify via Bluetooth, this is not the same as Connect. If you want to be certain, it is probably best to return the product.