Avoid to use that Cisco standard format for your username in the CCO.
My username used to be mrocha. I always worked for Cisco partners (more than 10 years). And in my last change of employers Cisco send me a email that from now I should use my full email address to log in in the CCO.
The great thing is that my profile information, PEC trainings, My orders, My Saving Configs, Support informacion and more were erased.
I love to use the PEC. But I lost all my resgistered trainings and the current status of each one.
I got the information that this username will be assigned to a employee called Marcia Rocha. Or that was the initial plan.