Hello Paolo,
I can provide you with the link, although due to your suggestion, I added the click “Anyone can register” and I was now unable to post without registering on desktop and mobile.
It also seemed to fix the mobile issue and now can post both mobile and desktop, but only through registration.
I’m not sure if I uncheck it will duplicate the bug, but can provide if you’d like, thanks.
check site now to see test posts functioning