I added my facebook and google accounts to Ubuntu online accounts recently but I keep getting the message "Connection to [email protected] failed No reason specified." Im not able to connect to any of my accounts using the Online accounts. But my pidgin account which dosent use the Online Accounts works fine.
I am not sure what your specific problem is, it may be similar to mine or different. I was able to fix my connection issues by removing all accounts (Ubuntu Online Accounts in Settings) , then signing out of all accounts (in all browsers) . After that I restarted the computer, and set everything up from scratch. Then it worked again.
Hope this helps and will fix your problem. If not, maybe someone else has a better suggestion.