Hi,

If you have the checkbox mapped to a field on the new record that gets created, then in your notification, you'd create the notification on that specific table with the condition of "insert" and then use the builder to set: field 'is' true. You wouldn't use the record producer script to fire an event and you wouldn't need to set the notification to trigger based on the event firing either.

From there, ensure the group has active members and at least 1 of those members has an email address in their user profile so that the notification will actually send out (a notification won't send unless it actually has a valid recipient).

If you require further assistance, please create your own question, but feel free to mention me in it.

I hope the above helps?

-Allen