When I use the “first name” tag in Messenger chatbot flow, and copy JSON code to include in my FB ads, the leads that open up the chatbot flow sees #LEAD_USER_FIRST_NAME# instead of their first name. How do I fix this?
Unfortunately, JSON code does not support personalized tags. This is a limitation on Facebook's side. Even if we want to have this, Facebook does not have the API to do this.
However, you can use M.me link and Bot payload if you wish to personalize your tags. You may refer to this article: