Expo Push notification not working in Testflight?


I am trying to send expo push notifications to a Testflight app with the Expo push notification tool (https://expo.io/dashboard/notifications). I created a “Apple Push Notification service SSL (Sandbox & Production)”. Retrieving the token works and notifications work in expo, but for Testflight apps, I get the following error:

Anyone knows what this means and how I could resolve that?

Best regards

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