Some quick things to try: 1) Try again, sometimes it is just issues on the backend. 2) Create a new prototype of anything, then try publishing it. If that works, try the real one again 3) If you can't publish the test one, make sure you have not reached your link limit based on your plan. 4) Sign out and sign in to your Creative Cloud account,
I'm having the same problem, tried these fours steps, but still no candy.
When I access the share tab, I get immediatly the "There was an error. Try again", even though I'm connected to the Adobe Cloud. If I insist and reach the "Create Link" button, I get the "You are not connected. Check your connection to the Internet and try again later" message.