Unable to retrieve custom fulfillment services through API endpoint

[EasyAds]

In my developer store I have created custom fulfillment services as described here:
https://help.shopify.com/en/manual/shipping/fulfillment-services/custom#activate-a-fulfillment-servi...

Unfortunately, I'm not able to retrieve those through this endpoint:
GET https://easyadsteststore.myshopify.com/admin/api/2020-04/fulfillment_services.json HTTP/1.1

It would be nice to be able to test this resource with the custom fulfillment services I've created for my developer store.
Does anyone have an idea to test this resource in a developer store?

[EasyAds · Accepted solution]

Okay issue can be closed, I missed the

?scope=all

Part in the documentation.

https://shopify.dev/docs/admin-api/rest/reference/shipping-and-fulfillment/fulfillmentservice?api[ve...