iCloud: Resend invitations to your shared album
If someone didn’t receive an invitation to your shared photo album, or if you want to remind someone to subscribe to your shared album, you can resend invitations.
On your iOS device (iOS 8 or later)
In the Photos app, tap Shared at the bottom of the screen, then tap Sharing at the top of the screen.
Tap the shared album that has the people you want to invite again, then tap People.
Tap the person you want to invite again, then tap Resend Invitation.
On a Mac using Photos, iPhoto, or Aperture
For instructions, see one of these Help topics:
Manage subscribers to shared albums in Photos
On a Windows computer
Open File Explorer (Windows 8 or later) or Windows Explorer (Windows 7), then select iCloud Photos.
Double-click Shared.
Double-click the shared album that has the people you want to invite again, then click Options in the toolbar.
If you see Info but don’t see Options in the toolbar, you don’t own the shared album.
Select the person you want to invite again, then click “Resend invitation.”