Hi Guillermo,
I hope all is well and safe for you and yours.
Thank you for the question.
Since the customer does not want to use the CCOID anymore because the CCOID is a shared ID.
The best recommendation is to create a new CCO ID/email address for the DA nomination.
Especially for service request related scenarios where the team may have open cases related to that CCOID or service issues.
I hope the above helps, and if not, let me know if you have any more questions.