Same here until I realized there is a recaptcha. You would need to accept some frames, cookies, js, xhrs from google.com, and gstatic.com in order to generate a dungeon.

I had to activate JS and go to https://www.dungeonstome.com/generator.html - which then generated https://www.dungeonstome.com/dungeon/1150189360.png for me.

Works fine for me as well