Hey Julien,
What Wwise integration version do you use? Yes, you should avoid using deprecated components.
Hmm... Did you add the AkRoomAwareObject to the emitters in your scene as well?
Otherwise, it sounds like you're doing it correctly, but it might be easier for you to compare what you're missing in your setup.
Did you watch this Spatial Audio Episode in Unity?
Let me know if this helps.