My Sync account isn't recognized?
According to "https://account.services.mozilla.com/" I have an account and data stored with Firefox Sync. However, when I try to log into Sync from "about:accounts" with the same email it doesn't recognize the account.
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It might be that you use that account which is not saved on server.Check once again if there is showing something like this Unknown account??
this article contains about sync problem : http://mzl.la/MHqQXd
sync also works different after Aurora 30,again this thread helps you https://support.mozilla.org/en-US/questions/995225
That's for the older version of Sync - Firefox 28 and earlier.
See this KB article - Sync your Firefox bookmarks, history, passwords and more