[JLSE-Admins] problem registering a new JLSE account

Hi, Following instructions in a recent email, I am trying to apply for a JLSE account. The username I selected is srizzi, same as my Argonne account. However, the form returns with the following error in red: Username is already in use, is not formatted correctly, or is not allowed. I would like to keep that username. Is there anything else I could try? Thanks, Silvio Rizzi ALCF