Hey Angel,
That's strange. Have you tried creating a custom script and test if Start() is called?
All of those Trigger On options in the AkEvent / AkAmbient is merely using the MonoBehaviour functions, like OnTriggerEnter() or Start(). So if those functions are working in a custom script, it should work for the integration as well. And Start() should definitely be called, as long as the game object you attach it to is enabled.
As for the Trigger Enter conditions, the same applies as above. AkTriggerEnter is simply using the OnTriggerEnter() function, so if you've got a Rigidbody + Trigger on it, it should work. I would definitely try to test this out in a custom script on the same game object.
Let us know if the functions in a custom script works.