Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
As the title says, i have parents that are able to receive messages but do not receive event notifications/reminders. I have them all selected as invitees and set reminders for “now”, “1 day before”, and “7 days before”. I receive the notifications as do some other members in the Pack.
Are you talking about events that don’t have their scouts invited. There is a known bug that prevents non-registered parents from receiving reminders if their scout isn’t invited.