Hi @leelecora48! If they received the automated email or incentive email, it's probably they haven't confirmed their subscription yet. They will go to your "Unconfirmed Subscribers", they need to click the button from the incentive email for them to appear on your confirmed list. :)
https://help.convertkit.com/en/articles/4008773-why-do-i-have-unconfirmed-subscribers56