Delivery customization extension - doesn't work in production store

Retired Boards Appdev Extensions
1

I am implementing a delivery customization extension, which works perfectly fine on my development store, but when installed on a customer’s production store, the following GraphQL query does not return anything about my function, therefore I can’t create a delivery customization.

query {
  shopifyFunctions(first: 25) {
    nodes {
      app {
        title
      }
      apiType
      title
      id
    }
  }
}

I am trying to run the query with the required access scopes enabled on the Admin API.

I am trying to follow the documentation about reordering delivery options:
https://shopify.dev/docs/apps/checkout/delivery-shipping/reorder-delivery-options/getting-started

The app will only be used on this client’s store as a custom app. I installed it via creating a “merchant install link” on the partner’s dashboard.
Are there any additional steps I should take to make it work? Has someone encountered such an issue?

I would be grateful for any help.

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