Caprine desktop notifications not working

Does anyone here use Caprine? Whenever someone sends me a message, I get an audible notification and the icon on Plank gets an orange dot under it. However, I don’t get the preview notification on the right side, at all. All of the settings in Caprine look correct as far as I can tell. Any suggestions?

There seems to be a huge number of issues with caprine. Lots and lots of notification issues e.g.

So maybe just a generic broken app.

Best raise on the maintainers github issue tracker

I seen they had a lot of issues listed. I had it working on UB the last time I used it, version 20.04. I wonder if there’s a better Facebook Messenger app?