Problems with a new ebook

Hi, I bought a new ebook today. After I downloaded the file, I immediately imported my ebook into Adobe Digital Editions and I did not use it anywhere else.

In the screenshot above you see: It is the blue underlined one.

Above you see, that my ebook reader is authorized.

When I rightklick on one of my older ebooks (which I use successfully with my Kobo Glo) under licence is shown my email-adress and my Adobe-ID.

As you see in the screenshot above: When I rightklick on this new ebook, under licence is shown "unknown". I cannot change that entry and I cannot read the book on my Kobo Glo. How come?

Please help me. Thanks a lot and greetings

Deschdy