Do I have to sign up? Newsweek just had me sign in a trial subscription
How do I sign up for share as requested by my family? Newsweek just had me sign up a trial subscription
iPad, iPadOS 14
Are you trying to join Family Sharing or are you trying to sign up for a shared Newsweek subscription?
For Family Sharing, from the article below.
Join a family group
Accept or decline an invitation to join a family directly from your device. You'll get an invitation sent to you by email or in a text message. Then you can respond right from the invitation. If you miss the email or text invitation, no problem. You can respond from your device Settings or System Preferences.
Apple News + has a family subscription that includes Newsweek.
Join Apple News+ in the News app - Apple Support