CC and BCC not working in Adaptive Forms

I am using the out-of-the-box "Send email" Submit Action for my Adaptive Form. When adding a value for the "CC" and "BCC" fields in my Adaptive Forms, they do NOT send the notification to the emails provided in the "CC" or "BCC" fields. Notifications only get sent to the email provided in the "TO" field.

Where are the CC and BCC fields configured? How can I enable the CC and BCC fields to work?