Couple with heart: person, person, medium-dark skin tone, light skin tone emoji π§πΎββ€οΈβπ§π» is part of the People & Body and Family emojis. On some systems it can be accessed by using :couple_with_heart_tone4-1:, :couple_with_heart_person_person_tone4_tone1: or :couple_with_heart_person_person_medium_dark_skin_tone_light_skin_tone: shortcodes.
It was approved as part of Unicode in 2020 so it should be displayed properly on newer devices.