A report from the Independent Inquiry into Child Sexual Abuse shows the Palace did not see a reason to change the previous precedent.
Queen Elizabeth II, Prince Charles, Prince William and Prince George appear in the picture that marks "the start of a new decade."
The Duke and Duchess of Sussex won't be on-hand for a drinks reception at Buckingham Palace this week that President Trump is expected to attend.
Etiquette experts say he also made a faux pas by clinking his glass against the royal's, though she smiled throughout the festivities.
The first lady wore a Dolce & Gabbana dress with navy trim and a matching hat to visit Buckingham Palace.
"This is the new power place, this is actually where power is, this is where a lot of attention is, this is the future of the monarchy."
The Duke and Duchess of Sussex joined Her Majesty at the prestigious Buckingham Palace ceremony last night.
A new book reveals the secrets to Prince Charles' regal life.