Tekka on the other hand has only a tenuous association with Luke due to his possession of the map, and gives no indication that he is aware of Rey’s existence at all.
We see him for about five minutes and there is no reason for him to tell Poe (or Kylo) about Rey, so I really don’t see the problem. And saying that having a crucial part of the map to Luke is “only a tenuous association” is an understatement.