While the estranged royal family members appear to use the HRH status privately on stationery and other notes, a Sussex source told Page Six that Prince Harry and Meghan Markle do not ask people to call them that. They reportedly insist on being called “Ma’am and Sir,” though sometimes others still call them HRH. The insider said:

After a video shared by Meghan Markle’s friend Jamie Kern Lima showed that Meghan still uses her Her Royal Highness (HRH) title in a private capacity, drama has ensued. Part of the buzz is that an angry Prince William could one day strip both Meghan and Prince Harry of their HRH titles,

Despite Meghan Markle and Prince Harry's decision to step back from their royal roles, the British monarch has limited power when it comes to stripping royal titles.