I bought a book on Google Play. When I download it to my Nook GlowLight I get an Error Dialog User Not Activated

I bought a book on Google Play Books.

I hate reading on my tablet or computer. I bought a Barnes and Noble Nook GlowLight.

I used this guide to export the book to my Nook: Transfer books to supported, non-Android devices - Google Play Help

When I try to open it in my Nook, I get a Error Dialog - User Not Activated.

The Nook has been authorized on ADE. I can read the book perfectly on ADE. But when I transfer it to the Nook, it fails.

Any ideas?