New answers tagged error-handling
I am 'registering' a new user through the Admin Panel instead of wp_login if that makes a difference. It does. The 'registration_errors' filter is applied in the register_new_user() function. That function is only used in wp-login.php. Searching through WP's source with grep you'll get something like this: $ grep -nr 'register_new_user(' . ...
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