iPhone photo sharing invitation cannot be made

Hey Vivian Su,

Thanks for the question. It sounds like you are experiencing issues sending iCloud Photo Sharing invitations. The following resource may provide some insight into your issue, along with a potential resolution:

Get help using iCloud Photo Sharing and shared albums - Apple Support

https://support.apple.com/en-us/HT201077

I sent email invitations to my shared album, but not everyone received one.

Try these steps:

1. Ask the invitees to check their junk or spam email folders for the invitation.
2. Send the invitation again. An invitee might not get the message if their mailbox is full, or if there's a filter that prevented the invite from being delivered.
3. If they didn't get the invitation, ask the invitee for another email address that you can send the invitation to. If you're using iOS 7 or later, you can also send the invitation to the phone number that they use for iMessages.
4. Ask the invitee if they've ever received an invitation, and if they might have unsubscribed from iCloud Photo Sharing emails. They can use the steps below to get email invitations again.

If they still don't get the invite, contact Apple Support for help.

Thanks,

Matt M.