Try deauthorizing Digital Editions and re-authorize it..
Try these steps,
1. Launch Digital Editions, Hold Ctrl+shift+D keys.
You will get a new prompt window to erase authorization.
click ' Erase Authorization'.
2. Close and re-launch ADE
Navigate to Help menu > Authorize Computer.
It should work.
I hope the deauthorize works.
Typical ADE. Usually it gives a completely cryptic error code and nothing else.
In your case it gave a clear English sentence; that was almost certainly wrong and as you say definitely confusing.
Thanks for your help!
Fingers crossed this appears to have worked and has let me authorize it with my existing ID.
I understand that software has restrictions as to what it can and can't do but it would help if they could use plain english to explain everything!!