Customer Account API: customer access token doesn't work for Storefront API

Hi,

we’re currently migrating to Customer Account API. Before we were using Storefront API to manage customers.
This changelog states that it should be possible to use the Storefront API with a customer access token retrieved from the new Customer Account API. However, when I try to query the customer using Storefront API with the freshly retrieved access token I just get null.

 query @inContext(buyer: {customerAccessToken:"[access_token_from_oauth]"}) {
    customer(customerAccessToken: "[access_token_from_oauth]") {
        id
        firstName
    }
  }

Now my question: Am I just holding it wrong or is it not intended to use the access token from the new Customer Account API with the Storefront API?

Did you udate api version you were using? paste documentation to chatgpt and your code and see