How can I use Back to My Mac using my Apple ID

I'm having problems accessing my other computers using Back to My Mac. I've gone into System Prefference>iCloud and turn on Back to My Mac on all mey devices. I've have also gone into my router settings and opened the appropriate ports. I can see my other divices in Finder. When I go to connect I am given a choice of "As a registered user" which works sometimes and not others and also "Using an Apple ID" when I choose this option my Apple ID appears in the drop down box (and is the only option in the drop down box). Howevere, when I click "Connect" it comes up with Authentication failed to JQ MacBook Air.

Any Ideas