I am having some trouble with creating an email alert on a sharepoint posts library to send to our All Staff group. Our All Staff group is a Security group with the Universal scope (Synced from our AD) but when I create an alert using this group it does not send them updates. However it does send out an email notifying everyone that I have subscribed them to alerts for this library. Other groups I have tested work with no issues. I have deleted and re-added the alert as recommended by Microsoft.