We want to schedule guest view permissions for a page (not a block, but the whole page).

My user is assigned to a group that, on said page, has permission to 'Edit Permissions'.

My user can access the Permissions dialog, click the View permission link, click the clock icon next to the guest entry, but then...

...a dialog box called "Add access Entity" appears with an 'Access Denied' message.

Performing the same task succeeds for those in my Administrator group.

Is there another permission I can set for this non-admin group that will allow them to edit the schedule for a permission, short of making this user an administrator?