How to customize Url + liedfield in emails campaign

Hello guys,



I’d like to send by automatic emails :

https://www.mydomain.com/product/{liedfield=firstname} but when I make the test, here is what is happening : https://www.mydomain.com/product/



The liedfield is not included.



Any idea? I’m using Sparkpost.



Thx

Hello guys,

I’d like to send by automatic emails :
https://www.mydomain.com/product/{liedfield=firstname} but when I make the test, here is what is happening : https://www.mydomain.com/product/

The liedfield is not included.

Any idea? I’m using Sparkpost.

Thx

What should I add in the html code?