If the setting "notify the user about authorization" is set in the personal account, then each time, upon successful authorization, the user will receive a message.
The setting is set in the user profile.
In this case, it should be borne in mind that for the correct operation of this setting, a special message template is required. If the template is not set, the notification will not come.
The message template is set in the "Messages" section. - "Notification of the user about authorization".
