Since you’re serializing the form, as ajax data, you could be missing the action part from your form:
<input type="hidden" name="action" value="bda_alert">
so your ajax request would contain
/wp-admin/admin-ajax.php?action=bda_alert&...
that should invoke the wp_ajax_bda_alert or wp_ajax_nopriv_bda_alert action callback.
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