On the Share your subscription pop-up, choose either:
**Invite -** The email you use to invite them should also be the email they use for their shared Office 365 subscription.
**Invite via link -** Select the **Copy** button to send the link via email, text, or other message to the person you want to share with. When they click the link and sign in with their Microsoft account, they’ll be added to your subscription. If you want to share with more than one person, create a separate link for each person.