downpay app - configuration issue. How to show pre-order/deposit option when a variant is out of sto

[Nosremetnarg]

I am configuring the downpay app on my store to app the functionality to take pre-orders when variants of products are out of stock. I am having an issue with this functionality. Has anyone successfully implemented this kind of UX?

I have several products I want to implement this feature on and only see it on one. There isnt a difference in the config aside from the product being different.