[RSS Feed/News] Extending registration

[XenForo]

I am trying to run a set of actions upon registration. Looking through some existing posts, it appears RegistrationComplete is the proper class to extend after the account is approved / validated, but I cannot seem to get the action to trigger upon successful registration.

class_extensions.xml
XML:

<?xml version="1.0" encoding="utf-8"?>
<class_extensions>
    <extension from_class="XF\Service\User\RegistrationComplete" to_class="Notes\XF\Service\User\RegistrationComplete"...

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