Not receiving notifications

I joined a couple groups. I receive notifications when people post to a couple of the groups I am a member of, but the most important group (Multisite) does not provide me with any notifications.

I am making posts to this group and find that I have to log back into elgg frequently throughout the day to see if anyone posts comments to my posts in the Multisite group.

How can I receive notifications from the Multisite Group just as I do with a couple other groups I am a member of?