Not Able to Add CC and BCC in my email in server script

Frappe Framework Custom Script
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1

Here is my function that i am using to send email. I have tries comma sepaarted string array also for all emails but nothing worked for me.

def send_confirmation_email(doc, subject, message, sender_email):
    """Send confirmation email to the sender"""
    try:
        logging.info(f"Sending confirmation email to {doc.sender} with subject: {subject} with cc: {doc.cc} and bcc: {doc.bcc}")
        frappe.sendmail(
            recipients=[doc.sender],
            sender=sender_email,
            subject=subject,
            cc=doc.cc,
            message=message,
            reference_doctype=doc.doctype,
            reference_name=doc.name,
            now=True
        )
        logging.info(f"Email sent successfully to {doc.sender}")
    except Exception as e:
        logging.error(f"Error sending email: {str(e)}")
        raise