Yeah, I talked to Sulruu first.
Tried to not talk to Darla and Daron didnt work, door was "locked door" and locked when i wanted to open it.
Tried talking to Darla and Daron, door was "locked door" and locked when i wanted to open it.
Tried talking only to Darla, door was "locked door" and locked when i wanted to open it.
Tried talking only to Daron, got no quest update, door was "locked door" and locked when i wanted to open it.
Tried taling to Daron and Darla (vica versa), door was "locked door" and locked when i wanted to open it.