Simple Sitemaps with MS Robots.txt – Sitemaps not displaying

I’m using Simple Sitemaps along with MS Robots.txt plugin to manage robots.txt and sitemaps across my network.

I’m currently experiencing issues with the sitemaps not displaying. I’ve only discovered this since adding a new site to my network. Previously, it was working, however I’ve now noticed that other sitemaps on the network no longer work either.

I’ve tried adjusting settings to see if there is any changes and duplicated settings from other networks that still seem to be working ok using these 2 plugins. If anyone has any idea I’d be glad to check it out. thanks