While the reason given for their absence was Archie's birthday, it seems that the US-based royals had other reasons for skipping the ceremony.
The royal family did not make any extraordinary efforts to ensure their presence, and it was reported that King Charles only wanted Harry there to avoid a potential problem if he did not attend.
Before the coronation, Harry and his wife had spoken publicly about feeling driven out of the UK, with some of their allegations seemingly aimed at Prince William and Kate Middleton.
Many believe that King Charles could have done more to convince Meghan to attend the coronation with her grandchildren.
By giving Kate and William's children important roles at the event and ignoring Harry's children, King Charles has seemingly taken sides.
This has left many feeling that Harry's children have been let down by their grandfather.
