Q: I can't accept my family share invitation.

Hello there, KevinPeterson.

Great job, so far, trying to accept your Family Sharing invitation on different devices. The following Knowledge Base article offers a variety of different ways to accept the invitation other than via the email:

Set up Family Sharing - Apple Support

Join a family group

You can accept or decline an invitation to join a family from your device:

• In iOS 8 on your iPhone, iPad, or iPod touch, go to Settings > iCloud > Invitations.
• In OS X Yosemite on your Mac, choose Apple menu > System Preferences > iCloud > Manage Family.
• If the invitation is sent to your email address, you can also respond right from your email.

To accept an invitation, follow the onscreen instructions. Here's what you'll be asked to do when you join:

• Confirm your Apple ID and password.
• Choose if you want to share your content and which iTunes Store account you want to share from.
• Choose if you want to share your location. If you agree, your location can be displayed on family members’ devices in Find My Friends and Messages, and the location of your shared devices will also appear on family members’ devices in Find My iPhone.

If you can't accept the invitation, see if someone else joined a family with your Apple ID or is sharing purchased content from your Apple ID. Remember, you can only join one family at a time, and you can only switch to a different family group once per year.

Thanks for being a part of Apple Support Communities.

Kind Regards,
Pedro.