Hey there! If you're using API calls for 'add' or 'sign up' to integrate LeadDigit with Emma, you'll be able to trigger a workflow to new sign-ups. When you set up the workflow for those new sign-ups, you'll want to make sure to select the "All" option as your sign-up source to include your LeadDigit integration.
Hope this helps! Let me know if you have questions!
UPDATE: The bug previously referenced in this post has been resolved.