Can't authorize with a previously used Adobe ID

When you try to authorize Adobe Digital Editions, you receive the following error:

"You can only authorize this computer with an Adobe ID that hasn't previously used to authorize any other computer or mobile device. Please try again."

Solution

Deauthorize the current user:

1. Open Adobe Digital Editions.
2. Press Control-Shift-D (Windows) or Shift-Command-D (Mac OS) to deauthorize Adobe Digital Editions.
3. Choose Help > Authorize Adobe Digital Editions.

Additional information

This issue occurs when you have previously activated with an anonymous ID. The deauthorization process deactivates the anonymous ID and allows you to sign in.

If  you made any purchases with the anonymous ID, contact the eBook provider to reset the activation information. Then, redownload the purchase and it is tied to the currently activated ID.