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Double check that the key your using matches up with the tabs here (There are Subscription Keys and Admin Keys)
Also, don't forget, that if you're trying to use the API for your own Private Gallery, it's NOT gallery.alteryx.com as this one is for the public gallery. For accessing the API that's using a localhost Server, the url would be http://localhost/gallery/api-docs/#subscription
You can find this link from the "Keys" tab where it says "Visit the Subscription interactive API documentation for more information."