I created and ran a module (campaign), The module was pretty small, I ran it Thursday without a hitch, everything was fine. I wanted to run it again with a different group of players so I created a Copy of the module without the Players. So the new module has a different link, this new link would not let the players in, I even tried to log in as a player from my laptop and it wouldn't recognize the link.
Now the link I originally sent to the players was wrong (my fault) I had put in an i where it was an l, damn maybe it was an upper case i and not an l, Geez I think I may have just figured it out. Although you might want to restrict using i and l or uppercase I, there is no mistaking an uppercase L. My bad I didn't copy the link I typed it in manually. I will test it.