Account change after SSO login

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http://ubuntuforums.org – Hi, SSO login using a different E-Mail address inadvertently took me to this new forum account. My original account was http://ubuntuforums.org/member.php?u=345842 (ngc2997) - I actually don't remember its registration E-Mail, but obviously it wasn't Gmail... I'd be grateful if someone please unlinked this new account from SSO and told me my original forum registration E-Mail (might have been g*.net or g*.de - although I'm unsure which of these exactly it was). Question for my next login attempt: do I need to set the forum registration address as preferred address in Ubuntu Login only once (Hardware)