Greetings JustWantHelpToday1,
It sounds like you are having an issue with not everyone getting the Shared Album invite. We know how important this is for you, and you’re in the right place for answers.
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. You can also send the invitation to the phone number that they use for Messages.
4. Ask the invitee if they've ever received an invitation, and if they might have unsubscribed from Shared Albums 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.
This info is located in this support article: If Shared Albums aren't working - Apple Support
Cheers!