Couple with heart: person, person, medium skin tone, medium-dark skin tone emoji π§π½ββ€οΈβπ§πΎ is part of the People & Body and Family emojis. On some systems it can be accessed by using :couple_with_heart_tone3-4:, :couple_with_heart_person_person_tone3_tone4: or :couple_with_heart_person_person_medium_skin_tone_medium_dark_skin_tone: shortcodes.
It was approved as part of Unicode in 2020 so it should be displayed properly on newer devices.