Hey @amystrickmanphd43! If they're ultimately signing up via the same form/landing page, it shouldn't matter how they got there (as in, that shouldn't affect whether the confirmation email gets delivered).
I'd recommend reviewing the troubleshooting steps in this article to ensure that none of those are affecting anything: Troubleshooting: Incentive Email Not Sending62
If the issue persists, please reach out to our team at help@convertkit.com31 (or via the in-app messenger in your account) with a description of this issue, the name of the form or landing page (as it is displayed on the forms page49 in your account), and an example subscriber who signed up to it but didn't receive the incentive email. One of our Product Specialists will be able to help troubleshoot further! ☺️