Scenario

Promotion Coupon code is not working in Webstore.

Solution

1. Navigate to Lists > Marketing > Promotion > New
2. Select a Promotion Type (Order-Based Promotions, Item-Based Promotions, Standard Promotion)
3. Make sure to select the website under Site Field (custrecord_advpromo_channel)
4. Click Save

Note: This is for Standard and Advanced Promotions only.