The Children's of Prince Harry and Meghan are expected to become Prince & Princess,
but they won't be awarded with the title His/Her Royal Highness by the King Charles.
Prince Harry had stepped down from his royal duties in January 2021
And he relocated with his wife and children's in Los Angeles.
This makes them ineligible as a "working royals"
Children's of Prince Harry and Meghan namely Archie and Lillibet won't be eligible
to use the same title as the Prince and Princess of Wales' children.