Notifications for Plesk Administrator are duplicated to another email address

Applicable to:

There are additional administrator accounts.
Notifications are sent to another email address, different than specified for administrator in Tools & Settings > Notifications or Plesk > Profile & Preferences for example test@example.com.
Email address assinged to the additional administrator account in Plesk database:

# plesk db "select login,aemail from admin_aliases where aemail='test@example.com'"
+--------------+-------------------+
| login | email |
+--------------+-------------------+
| johndoe | test@example.com |
+--------------+-------------------+

Email for additional administrator accounts is incorrect.

Click on a section to expand

Solution 1: Change email to the correct one

Log in to Plesk under the primary administrator account.
Change the email for proper one: Tools & Settings > Additional Administrator Accounts > johndoe > Email:

Solution 2: Remove additional administrator account

Log in to Plesk under the primary administrator account in Plesk.
Delete additional administrator account: Tools & Settings > Additional Administrator Accounts > johndoe > Remove:

Solution 3: Suspend additional administrator account

Log in to Plesk under the primary administrator account.
Suspend additional administrator account: Tools & Settings > Additional Administrator Accounts > johndoe > click More > Suspend: