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Firefox sync does not recognise existing account

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Hi I'm trying to set up FF sync on a clean install on a new windows machine.

When I try to login into FF sync I get:

"Unknown account. Sign up"

The thing is this is exactly the email account I'm signed in with on my other machines. I went to the trouble of resetting the password on one of them which forced type in the new passward on the other machines.

This leads me to conclude that I am using the right email address and password.

My only thought is that on the initial start up I progressed seomwhat down the sign up process (user id password) before realising it was sign UP not sign IN.


Thanks in advance,