Form Relations not firing Model Observers?

So instead of the hooks, I have observer for the models. This happens to be in a form relation.
My problem is that the observer aren't firiing when I add a new item of the relationship's Repeater field.
Also not getting fired after updating the fields inside the repeater.

How can I successfully tap into it? My goal is to send email whenever it add items and update items inside the repeater field.

Thanks!
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