TestFlight: ProximityReader ReadError 7 / "Code: 400"

Last updated: June 24, 2026

Quick answer

Usually a profile/entitlement or environment mismatch. Confirm entitlement, terminal profile, and sandbox-vs-production account on the device. See Creating a Sandbox Apple Account and Getting Ready for Production.

Symptoms

  • ReadError 7
  • ProximityReader
  • Code: 400

Solution

Usually a profile, entitlement, or environment mismatch. Confirm the Tap to Pay entitlement, terminal profile, and that the device is signed into the correct Sandbox vs production account.

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See also