Actually when Tieflings, Aasimar.
, and Genasi began to be normalized, it was in the Forgotten Realms during the 3e era, when Tieflings and Aasimar, first they appeared in the MM as a playable race (with level adjusement) and later more playable level adjustment free humaniod versions of Aasimar, Tieflings, and Genasi, appeared in 3.5e for the Forgotten Realms and in races of Faerun. This lead to Tieflings and Aasimar and in cases Genasi appearing in Icewind Dale 1&2, Planescape Torment, Baldur's Gate 2, Neverwinter Nights 2 (not sure about NWN1), BG3, Warriors of Waterdeep, Neverwinter MMO, etc...
And that is on top of greatly increased in Importance for Tieflings, Genasi, and Aasimar/Devas in 4e.
Also Aasimar and Tieflings have appeared in a whole bunch of third party settings (both are part of the 3e/3.5e SRD).
Some examples are Midguard/Southland setting, Pathfinders Golarion, maybe Starfinder?
They appear in Kingmaker and Wrath of the Righteous.
Also in Pathfinder TTRPG 1st & 2nd edition.
Undoubtly others.