Endermen usually teleport to get away from bright light including sunlight, but if they are standing on soul sand they won't teleport.
MC-263166
Endermen won't teleport to seek shelter from light when they're standing on soul sand
Open
1
(Unassigned)
Confirmed
Gameplay
Low
Mob behaviour
1.19.4, 1.20 Release Candidate 1, 1.20, 1.20.2, 1.20.4
Retrieved
This could be a duplicate of MC-223609. Both describe the behavior of endermen not teleporting when their feet are inside a block. The only difference is the height.