I am experiencing the same issue w\ Android Beta App 2.37.0.b116
I have 3 cam groups designated for actions within a single rule.
While the “Turn On Camera” and "“Turn On Motion Detection” actions for the group shows, the “Turn On Notifications” action for each cam group does not.
However, the rule does execute perfectly and each individual cam within each of the groups shows a successful execution of “Turn On Notifications” within the rules history.
It appears to be an app bug with displaying the Turn On Notifications action when applied to groups. It does not affect functionality.