BCC don't work in form

My form does not send an email that I have filled in at BCC.
Can someone tell me why not?

It will be easiest to troubleshoot if you open a support ticket here https://www.gravityforms.com/open-support-ticket/

But, the first step will be to enable logging, then test the form. Refer back to the log to see what Gravity Forms is doing with your notification.