POS Cart Extension not displaying anything

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We are currently implementing the POS cart extension API. But even if we exactly return the response written in the docs, the all new POS does not display anything. For testing, the Endpoint can be found here (https://anna-loyalty-test.nextint.de/api/pos-extension-api/promotions) and returns the exact same response from the docs for each request.

We are using the iOS POS Version 6.50.0 on an iPad. When selecting a customer, we see in our server logs, that a request from Shopify arrives, and we answer with an HTTP 200 response and the JSON Content but nowhere in the POS the discount or the point balance can be found.

Any hint what we are missing would be greatly appreciated as we are running out of ideas what could cause this issue.