The books you sync from the Kobo server to a Kobo device have Kobo DRM. This is completely different to Adobe DRM, I don't think you can transfer books with Kobo DRM to another device (unless you remove the DRM.)
If you want to put the books you buy from Kobo on other devices (without removing DRM) then download them from the Kobo website via ADE. Then the downloaded book will have Adobe DRM and you can transfer it to any device authorised to the same Adobe user.
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