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White ink should not be in an alpha channel. Alpha channels don’t print, and they are different than a spot color channel. A spot color channel is technically set up to let print devices know that it should be printed, independently of colors that will be screened into CMYK inks, and independently of other spot color inks.
Make sure the spot color channel was created using the New Spot Channel command, not the New Channel command. If the content is in the wrong channel, I think you should be able to copy and paste between alpha and spot channels.

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