Subscribe Button Missing from Discussion

[DavidMarchino]

Hello, Canvas Community. 

I created a handful of Discussion boards for students, but, in one of them, the "Subscribe" button is not present. See the attached image "No Subscribe" compared to another discussion (attached image "Subscribe"). 

Is there a setting I can toggle to return the subscribe button?

[sphinney]

I think if the "Users must post before seeing replies" box is checked, then you don't see the "Subscribe" button. Was that box checked?