How to view an offsite payment app in a store settings

Hi,

We have created an app + app extension for an offsite payment app.

I visit the app in partners.shopify.com, and do a test install on a new store then it seems to work (no errors/etc)

Then if i login to that store and go settings → payments → add new payment method, it does not show up.

I need to be able to see it there, to hit the ‘activate’ button so i can see it on the store checkout.

We have another test app where this flow works, and all the settings look identical.

What is preventing us from seeing the offsite payment app when we go into a store’s settings?

thank you