I had to de-authorize my audible account as i was incorrect, how do i authorize it with my correct audible account in itunes

I had a problem with this a few weeks ago, and found that I had to:

• contact Audible support and get then to de-authorize all devices associated with my Audible account
• add a new audiobook (or delete then re-add one) to iTunes - this required me to authorize my account via the Audible website - this seemed to work correctly where playing existing Audible content (which initiated the same process) did not work