Digital editions authorisation

I have successfully downloaded ADE on my computer and got ID.  I then successfully downloaded the E book I bought fro E book sales onto PC and on my Android phone. Both are working well. I have a Kobo reader and have downloaded ADE and the E book to the Kobo reader but it wont open saying it requires authorisation.  This I Have not been able to activate. Please help.

I noticed the same thing on my computer when I downloaded ADE.  In my case I had authorized and unauthorized after a previous download so I assumed that it just automatically authorized itself.  If you check the next line below that.......the authorization information.....it should say if your computer is authorized.