Princess Eugenie and Jack Brooksbank
Princess Eugenie and Jack Brooksbank's monogram doesn't have a crown. Pictured: Princess Eugenie and Brooksbank in the Picture Gallery at Buckingham Palace in London on Jan. 22, 2018, after the announcement of their engagement. Getty Images/Jonathan Brady

Princess Eugenie and Jack Brooksbank's official monogram has been released but something's missing.

Just weeks ahead Princess Eugenie and Jack Brooksbank's royal wedding, the palace released their official joint monogram. However, according to People, there's a major key that's missing in the couple's cipher.

Unlike Prince William and Kate Middleton, and Prince Harry and Meghan Markle, Princess Eugenie and Brooksbank's joint monogram doesn't feature a crown. Also, Princess Eugenie's solo monogram is topped by a coronet, but Brookbank's doesn't have one.

The publication believes that this is a hint that the groom will not receive a royal title. Unlike the two duchesses, their individual monogram features a coronet.

The Duchess of Sussex individual and joint monograms with Prince Harry are topped by a coronet that features two crosses pattee, four fleurs-de-lys and two strawberry leaves. On the other hand, the Duchess of Cambridge's and her official joint cipher with Prince William features an ornate with "C" for "Catherine" her full name and a coronet with cross pattee and fleurs-de-lys, too.

There have been rumors that Brookbank will not receive a title from the Queen because men do not share the rank of their wives. In fact, Prince Philip was never called king even if his wife is the Queen.

"Jack will not be getting any title from the Queen," royal expert Marlene Eilers Koenig said. "The precedent was set by Princess Alexandra and the Hon. Mr. Angus Ogilvy in 1963. He turned down an earldom. Princess Anne and Mark Phillips also turned down an earldom from the Queen in 1973."

Former royal butler Grant Harrold shares the same belief.

"Not all members of the Royal family are given further titles," Harrold told Express. "In fact, it has become normal practice for Royals not to be given titles. An example would be HRH Princess Anne's husband not getting a title."

However, James Brookes have a different opinion. According to him, Queen Elizabeth II will offer the groom a title and it's a personal choice if Brooksbank will accept it or not. The Queen offered Princess Anne's first husband Mark Phillips a title, but the latter turned it down.