What Stayhigh said.
It started out as a forum thing, then ended up with hundreds of people that no one knew joining in.
I started an invitation only one, but only got about 10 STWers join, so gave up after that.
I’m getting the access denied message too.
It might be better to allow anyone to join, then delete the non-STWers.
That’s not easy though, matching up STW with Endomondo names.
Edit;
Just reopened the tab and got access.
Anyone else who’s tried, give it a few minutes then. I know Endomondo can be a bit slow uploading rides. Looks like it’s slow allowing access too.