Why Harry and Meghan just reunited with William and Kate

Prince Harry and Meghan Markle recently returned to the UK for their bittersweet farewell tour, in which they carried out their last duties (for now) as working senior royals of the royal family. One of their final events before their transition from royal life is complete reunited them with Prince William and Kate Middleton.

The Fab Four were all at Westminster Abbey on March 9 for the Commonwealth Service, a celebration of the UK's longstanding relationship with 54 other states (per AOL). Prince Harry and Markle's last official engagement was low-key. The two couples didn't participate in Queen Elizabeth's procession, but were instead immediately seated at the interfaith ceremony.

Prince Harry have been in the UK since the end of February, while Markle joined her husband at the beginning of March — baby Archie was left at home in Canada. Other engagements on the couple's final tour included Prince Harry collaborating with Jon Bon Jovi and Markle visiting a school on International Women's Day.

There seemed to be tension between the Fab Four

While the world has had time to process the news that Markle and Prince Harry are stepping back from the royal family, it seems that there is still some tension among the royals regarding the decision. According to People, things were a bit chilly at the Commonwealth Service. While the Duke and Duchess of Sussex exchanged greetings with Prince William and Middleton, Middleton reportedly avoided making eye contact and the two couples did not have any significant interactions.

While the tension may have been due to Megxit, it's possible that the cold interaction is the result of an earlier rift. A source previously told People that the Fab Four has been drifting apart for a while. "They are on different paths now," said the source. "It's just the reality of the situation."

Queen Elizabeth was also in attendance at the event. According to Vanity Fair, the monarch is also unhappy with the current situation. "She generally doesn't want to talk about it," a source told the outlet. "The Queen has been keen to get this resolved because she sees it is damaging to the monarchy and on a personal level I think this has been rather hurtful for her. She has got to the point where she doesn't want to think about it anymore, she just wants it over and done with."