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I'm having the exact same problem. I actually saw a message confirming that the link was successful, but I couldn't login to the actual client. It gave me the missing Origin account error text. I then revisited the link page to retry linking but then it started to give the mentioned error.
As suggested on the answers.ea forums I contacted a so called EA Advisor and asked him to unlink my Origin account to this unexisting Emulator Nexus account. He claimed EA cannot unlink Origin accounts (Even though EA officials redirected me to the Advisor).
I hope you guys can unlink accounts so we can atleast try again?