Have you added the additional scopes as requested while creating the connection?
Additional scopes are required for the Make an API Call module. For details, see the Klaviyo API Documentation. Add scopes for every API call you will make with this connection.
In your Klaviyo Make an API Call module you hardcoded one email - your request will always filter Klaviyo results to this email only. so that could be the case your scenario is not working properly.