Hi,
I think the code is generated when you opened the website but starting from adding the transactions, there is no generated code in these transactions in your script.
It might be Web (HTTP/HTML) protocol is not the suitable protocol for your application. So it can not capture that part.
Could you please try to use Protocol Advisor utility in Vugen/ Record tab/ Protocol Advisor/ Analyze Application to find which protocol will be suitable to your application?
Please try and share the result after analyzing.
Thanks and Regards,
Chau Nguyen