London (CNN) Buckingham Palace is working to revise its guidance on how Prince Harry and his wife, Meghan Markle, are to be addressed after reports that the Duchess of Sussex's new title made it sound as though she were divorced.

The palace last week said t he two would no longer use their royal titles -- His and Her Royal Highness -- beginning this spring, but would instead be addressed as "Harry, Duke of Sussex" and "Meghan, Duchess of Sussex."

The problem is that such formatting was adopted by Sarah Ferguson -- now addressed as "Sarah, Duchess of York" -- after she divorced Prince Andrew in 1996. And Harry's mother was known as Diana, Princess of Wales after her divorce from Prince Charles.

It's one of the first hiccups, but not likely the last, in the complicated process of carrying out the unprecedented deal the Queen reached with the couple last week after the two said they wanted to scale back their royal duties

According to the palace, the titles of Duke and Duchess of Sussex are not subject to change, but updated guidance for how the names should be formatted is being prepared.

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