I click continue in the content warning box and it just reloads the page and the content warning prompt box reappears, is there some secret thing I have to do first?
I think you could just go to the community you're interested in through your current instance.
Try this (nsfw.... obviously): !gonewild@lemmynsfw.com
I'm not sure why you can't get past that message though. Works for me on Android Firefox.