I believe that this should now work again. Please email me at firstname.lastname@example.org if it does not.
As explained in the previous post, Strava recently stopped making athlete emails available to apps like Crickles and we’ve had to change our sign-up process accordingly. Unfortunately, it’s not currently working for new users. It may take a while to fix this for practical reasons (I’m in Colombia, my laptop is not); when it’s working I’ll post an update.