When trying to login using my LaunchPad account I'm told it's already in use

Please make sure you are logged out and try logging in again.

Per IRC conversation, this no longer effects the user.

I get the same error message.

I'm unable to logout whatever account is still logged in. This could be related to an account merge a while back.

Kaj, yes, it is related to the merge. To fix it, I will need the email address you login to SSO with.

The email for my current SSO account is <email address hidden>

I don't have anyone with your username in Summit. What other email addresses and usernames have you used?

The account I used for last UDS, and the one now merged with zequence was called ailo.at. Not sure about the email adress, but could be the same. Or, <email address hidden>.
There's also possible variations on @mousike.me, like <email address hidden>.

..and a small possible chance for the email <email address hidden> :P

UDS is over this time around, but I might have use for my account working there in the future, so if there's anything more I can do to help straighten this out.. :)

We are having more difficulty finding your account than we normally do. I have submitted an RT and I am waiting for assistance from the admins of SSO. Until then, there is nothing I can do.

I have the same problem:
The username (tosho) with which you tried to log in is already in use for a different account.