Subscriptions not working for guest user

I attempted to activate subscribing to a blog via email. I have, what I believe to be, all the settings in place to allow an anonymous user to subscribe (see attached EasyBlog-Settings-Subscriptions.png). I have also attempted this with all settings for types of subscriptions (entry subscriptions, blogger subscriptions, etc) set to Yes. I continue to get the message "You do not have the permission to subscribe to this blog" (see attached EasyBlog-Guest-Result.png).

What do I need to change to enable this feature?