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Nevermind, found it:
Publishing module translation files
Perhaps these kind of stuff should be on a separate section of the Documentation? (e.g: customizing/fine-tuning core modules) ?
There are two things going on.
First UserHasRegistered is firing correctly, but you have to see where. The event you are looking for is firing when you fill out register form on frontend (auth/register).
Second one from the admin(backend) when you create manually new user it has no event attached to it.
If you want for event to fire also from backend manual creations you have to modify User module code.
Assuming you are using default user driver (Sentinel):
In Modules/User/Repositories/Sentinel/SentinelUserRepository.php change following function:
Filled PR on Asgard User module
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