Export to Quicktime with alpha channel

I'm trying to export my Keynote project to a Quicktime video with a tranparent background.  I set my slide backgrounds to None. In the export panel I've selected the "User Transparency" option and under Custom settings I've selected Animation with Millions + colors.
When I export the file it has a white background instead of transparent.
Has anyone else had any success getting this to work?

Do not render the contents of the sequence. If you render, the sequence is exported using the render files. With the sequence unrendered export using the Animation codec with colors set to millions+.

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