Hello @CraftingLife-WithWendy ,
Once you have turned Confirmed Opt-In on, there is an automatic email that is sent out to complete the sign up. You shouldn't need to add an Opt-In confirmation email to a series.
However, if you don't want to use Confirmed Opt-In, there is one pre-existing template in the template picker that you could add to an automated series that is for confirming opt-ins. You can search the term "opt-in" and it will show you the "CASL Permission" template. You can edit this template to address the specific reason why you are having the contact re-confirm their opt-in.
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