“It’s like looking in the mirror,” the prince quips before ushering the pop star inside.

This is the opening scene of a video released on Thursday in which Queen Elizabeth’s grandson and the Grammy-winning musician join forces to campaign on an issue both care about deeply.

The clip, posted on Harry’s Instagram page, shows the pair sitting at a table talking about their joint passion, but after a short while it becomes clear there is a misunderstanding.

“This for me is a subject and a conversation that is just not talked about enough. I think people all over the world are really suffering,” Harry says.

Sheeran responds that he has been trying to write a song about the issue to help raise awareness. He then adds: “People just don’t understand what it’s like for people like us.”

Looking confused, Harry asks: “What?” So Sheeran elaborates: “You know, the jokes and snide comments, I just feel like it’s time that we stood up and said, you know, we’re not going to take this any more. We are ginger and we’re going to fight.”

Apparently embarrassed, Harry says: “OK. Slightly awkward,” before going on to explain that he was not talking about discrimination against people with red hair, but rather about World Mental Health Day.

Hastily deleting the words “GINGERS UNITE” from a document on his laptop, Sheeran quickly gets on-message and the video closes with the pair urging people to reach out to anyone who may be suffering from mental health problems.

Harry, sixth-in-line to the British throne, has long campaigned on the issue. On Thursday, he was in Nottingham, central England, visiting community projects aimed at preventing mental health problems and violence among young people.

Harry and his wife Meghan, whose official titles are the Duke and Duchess of Sussex, have increasingly used the Internet to engage directly with the public. Both have launched legal action against British media outlets over coverage they deem intrusive and inaccurate.