Notifications not being received for observation checklists

Summary:

We have been testing observation checklists however the observer is not receiving a notification.

Content (please ensure you mask any confidential information):

When we tested observation checklists originally, they worked really well, except when a line manager was the observer. In those instances the line manager did not receive a notification.

I've just done some further testing since 24B was applied and no notifications are being sent now - so the observer cannot access the the checklist to complete it. In one case, where the manager was an observer, the system has just autocompleted the checklist activity.

Is there a profile option we should be switching on?