Check the Integration ID on your Promo in OrderCloud. It must be typed EXACTLY like it is on Square. *Note: you may define a 100% discount, but Square will not recognize if you define a maximum amount to be discounted.
To Check the Integration ID on a promo
Login to OrderCloud
Select Engagements
Under the Active Promotions section, Select the Promo
View the Integration ID and change if needed
Select Save Promo
9/15/2022