Adding members to family plan LifeLock

Please review: recent related:
https://community.norton.com/t/how-does-one-create-logins-for-people-on-my-account-so-they-can-see-their-notifications-if-it-s-tied-to-my-email/237469/7

https://community.norton.com/t/how-does-one-create-logins-for-people-on-my-account-so-they-can-see-their-notifications-if-it-s-tied-to-my-email/237469/8

https://community.norton.com/t/message-you-already-have-an-existing-membership-issue-case-88122096/238517/2