Earlier quoted context omitted.
I have an OpenShift account and now I'm shown an "additional action needed" page on login. When i complete it and hit submit, it tells me that email already exists. Not at all pleasant :(
I'll see if we can get a fix pushed out for this today/ASAP. The issue currently occurs when you have multiple Red Hat accounts that use the same email address (or a sub-addressed version of the same email address, like "chris@gmail.com" and "chris+123@gmail.com".
Is this a special case for Google mail or do you assume foo+bar@example.domain is the same as foo@example.domain ? Why?