New CDS Credentials - confused

So, my current CDS credentials and API Key are not going to work with the new CDS,

“A new UserID (ECMWF) and API key will be needed.”

Confused… How can I generate a new UserID and API Key with my current email address?

Last time I tried, it told me my email is already registered.

So do I need to get myself a new email address (and make my IT folk unhappy)?

Or how do I get a new UserID and Key with my current email address?