Subscribe menu not visible for site admins in Multisite

Hi,
With the latest version of Subscribe By Email, Network Activated, site admins cannot access the menu in the admin panel of their subsites. When I am logged in as super admin I can go to the admin area of a subsite and I see Subscribe By Email listed among the menus, but when logged in as the user (admin) of that site it is not there.

I checked if my Menu Editor was restricting access but it confirms that the plugin will not display for users other than the super admin.

The Settings page in my Network admin panel contains no option to control this.

Appreciate any advice.