The confirmation email is the Pending email configured in CB > Configuration > Registration. If it doesn't have a subject and body it will not send. By default it should be the following language strings.
Pending Email Subject: YOUR_REGISTRATION_IS_PENDING_APPROVAL_SUBJECT
Pending Email Body: YOUR_REGISTRATION_IS_PENDING_APPROVAL_MESSAGE
Welcome Email Subject: YOUR_REGISTRATION_IS_APPROVED_SUBJECT
Welcome Email Body: YOUR_REGISTRATION_IS_APPROVED_MESSAGE
Please read your CBSubs documentation and the CB 2.0 Primer Book carefully as the registration workflows is all explained there. You may also want to check out the following videos.
CB Videos:
www.youtube.com/playlist?list=PLp0puRITgC7PuyzPsMUECDI46VE7IFSAX
CBSubs Videos:
www.youtube.com/playlist?list=PLp0puRITgC7NcxbEMg7iTNboV_WhIsgaZ