Email address for additional installations

If I install Norton 360 on a second device where the user has a different email address to the original, which email address is used on the second device?

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As the primary Norton Account holder, it is your email address that is used by you to access your Norton Account.

When you send an email invitation to another user to share your subscription activations, you send it to their email address. That gives them a download link to install 360 on their computer and it is preactivated on your subscription. There is nothing else done with their email address. They cannot access your Norton Account with their email.