Discount from spin to win discount apps not showing; no box to even enter it

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I've tried multiple spin to win apps now (the current one I'm using is by secomapp) and the discount is not shown at checkout.  Is this an issue with my shopify settings?  I want my customers to be able to see the discount before they enter their credit card information and before they pay.   There is no box to enter a discount code and yes, I have a discount code active from spin to win(by secomapp).