Most of the time, this issue occurs because other upsell apps are generating discount codes separately, which leads to conflicts with the discount codes created by our app.
It's important to be aware of Shopify's discount combination rules, refer to this article: https://help.shopify.com/en/manual/discounts/combining-discounts
If, during your testing, the discount code from our app should be applied and is eligible based on Shopify's rules, please provide us with detailed information on which products you added. If possible, also include a screen recording to help us better understand and reproduce the issue.
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