FluidApp notifications are not working

I can't seem to make the notifications in fluid app work. The checkbox Allow sites to display notifications is checked. I also tried to check if it worked via userscript but had no luck with that either. window.fluid.showUserNotification({ title: "title", subtitle:"subtitle", description: "informText", sound: "Basso", onclick: function() { alert(1); } }); I also tried to paste that directly into the console that too didn't work. I'm using MacOS High Sierra. I'm also sure that the notifications don't work on MacOS Sierra as well. Is it just me? Or do the notifications not work in FluidApp for "newer" MacOS versions?