No. You previously authorized the computer anonymously, and you can only 'upgrade' an anonymous user to one that hasn't been used before.
You can either de-authorize the anonymous user (and lose all access to content tied to that user), or you can use a brand new AdobeID that hasn't been used for ebooks before.
If you just activated anonymously by mistake and don't have any content yet, you most likely want to deactivate and start again.
Thank you! I was able to resolve the problem by de-authorizing the Anonymous login. I swtiched to Anonymous (from not-authorized) in order to get screenshots of ebook downloading.
So, for anyone else who get this error, do the following:
- Open ADE 2.0
- Press CTRL + SHIFT + D (or Command + SHIFT + D on a Mac)
- Follow steps to deauthorize device.
- Go ahead and authorize ADE 2.0 with an existing Adobe ID by selecting "Help > Authorize Computer..."