Kiss: person, person, medium-dark skin tone, dark skin tone emoji π§πΎββ€οΈβπβπ§πΏ is part of the People & Body and Family emojis. On some systems it can be accessed by using :kiss_tone4-5:, :couple_kiss_tone4-5:, :couplekiss_tone4-5:, :kiss_person_person_tone4_tone5: or :kiss_person_person_medium_dark_skin_tone_dark_skin_tone: shortcodes.
It was approved as part of Unicode in 2020 so it should be displayed properly on newer devices.