In-App Purchase Fails in testflight

I’m testing iOS in-app purchases with testflight, but I always get an error.
Can you tell me why and how to fix it?

Steps to Reproduce

  1. complete the build
  2. create a test account in sandbox.
    Sign in to the account you created in step 2 with your test device.
  3. install the target app in testflight.
  4. test (error occurs)

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