Why doesn't my personal code combine with other offers?

Most likely because the promotion behind the code is set to Exclusivity = Global.

A Global promotion cannot be combined with any other promotion. When the code is applied, the customer loses the other benefits, including:

• other discounts
• gifts with purchase
• free shipping
• approaching promotion messages for other offers

How to fix it

• Set Exclusivity to No if the code may combine with everything
• Set it to Class if the code must not combine with promotions of the same class only (e.g. no second order discount, but free shipping allowed)
• Use Combinable Promotions or Mutually Exclusive Promotions for specific exceptions

👉 Go to: Merchant Tools → Online Marketing → Promotions, open the promotion, section Compatibility.