PWA NOT WORKING

I’m trying to setup pwa with your plugin.My website seems to satisfy all the requirements.The color of the address bar changes when the plugin is activated.But that’s where it ends.No add to homescreen popup and even if I try it out manually it doesn’t work.It would be Awesome if you guys could give it a try and see If I’m doing something wrong.

The page I need help with: [log in to see the link]