Hi @saintstar ,

Welcome to the Community.

This could be for multiple reasons so let me just lay out some ideas.

For auto-applying a static coupon, the URL setup would be the following: 
mysite.com/discount/CouponName
For auto-applying a dynamic coupon, it would look like this: 
mysite.com/discount/{% coupon_code 'your_code' %} 

You would not need to add https:// before your link. Please note that the auto apply will only work once live and not in preview. It's worth sending a test profile through the flow whilst in manual mode to check.

Related Articles:

Add a Single Static Coupon Code For Everyone
How to Add Link that Applies a Coupon Code to a Shopify Cart
Unique Coupon Codes for Shopify

Hope that helped,

Alex

Hello thank you for your help, but it doesn't work

1. I created a coupon 
2. I used the link I tell you above: mysite.com/discount/{% coupon_code 'your_code' %} OR mysite.com/discount/CouponName in LIVE CAMPAIGN 
3. It redirects me on 404 error on the website 

How can i fix?

Hey @saintstar, to provide more context, which email are using this in? Could you send a screenshot of how you have this?

this is the site: https://www.bonbonsdolcisardi.it/

this is one of the code: bonbonsdolcisardi.it/discount/BENVENUTO10

this is the other one: bonbonsdolcisardi.it/{% coupon_code 'BENVENUTO10' %}

Here below you can find the coupon 

which other kind of info do you need?

@saintstar for the static code: BENVENUTO10

I just tried it on your site without the link at the checkout and it says the discount code is not an active one. 

For the dynamic version, I believe the format needs to be like this: bonbonsdolcisardi.it/discount/{% coupon_code 'BENVENUTO10' %}