"He should have shaved it off for such an important day", a serving member of the cavalry regiment said in a Metro article.
Harry, who was pictured alongside brother William and father Charles, could be seen sporting a beard which goes against British Army practice.
The Queen watched on for the first time in her 65-year reign as Prince Charles led Remembrance Sunday commemorations at the Cenotaph in Whitehall.
Prince Philip, Duke of Edinburgh, Queen Elizabeth II and Camilla, Duchess of Cornwall during the annual Remembrance Sunday memorial on November 12, 2017 in London, England.
And the question of whether Prince Harry had let down the nation, the military or himself was even debated by people in other countries.
All were dressed in dark clothing as they watched from the royal box, with the Queen acknowledging the gathered servicemen and women with a wave.
Fans of Prince Harry have defended him today after he was criticised for not being clean shaven at a Remembrance Sunday service.
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British Army rules forbid beards, except for a few circumstances, such as strong religious reasons for retaining facial hair.
According to Forces.net, the only military rank permitted to wear a beard while on official duty - during a parade, for instance - is the Pioneer Sergeant.
The Blues and Royals is one of the most prestigious regiments in the military, the Queen is Colonel-in-chief, and it can trace back its history to the days of Oliver Cromwell's 17th Century New Model Army.
Britain's Prince Harry places a poppy as he attends the official opening ceremony of The Field of Remembrance at Westminster Abbey in London.
Members of the public quickly jumped to the prince's defence, many pointing out that he retired from active duty two years ago.
Harry now concentrates on charity work and other Royal duties, but would normally be expected to abide by military regulations when in uniform.