There are multiple reasons why your discount / promotion code may not be working.
You may need to clear your cookies, cache, and browser history. You may also place your order using a private browser aka incognito mode.
You may be entering the discount/promo code incorrectly: make sure it's exactly as you received it, without any spaces. Make sure to click 'Apply Code' for it to apply to your order.
You may not be eligible.  Some discount/promo codes are only eligible for a one-time-use only.
If your discount code is still not working after checking all of the above, please get in touch with us at cs@igelbeauty.com and we will replicate this order on our end.