How can I get Shopify auto emails to send after getting an email in a Klaviyo pop up?

I’m trying to get a shopify automated emails flow to trigger after getting an email from a klaviyo pop up. I can’t get shopify email to auto send the flow, even though the new subscriber shows in both shopify and klaviyo. How can I get shopify emails to recognize a new sub from klaviyo, which then triggers that auto email?

Thank you for the help!