iCloud: Resend invitations to your shared albums in iCloud
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 a Mac using Photos
See Add or remove subscribers to shared albums in Photos on Mac in the Photos User Guide.
On a Windows computer
Go to your shared albums.
In the iCloud for Windows app (version 10): Choose Start menu > iCloud Shared Albums.
In the iCloud for Windows app (version 7): Open File Explorer (Windows 8 or later) or Windows Explorer (Windows 7), select iCloud Photos, then 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.”