iPhone Duo: NFCISO7816Tag reads fail with error 102 while connected to Wi-Fi

App & System Services Networking
AxM OP
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tl;dr: On iPhone Duo with connected WiFi it is not possible to fully verify/scan a NFC ePassport.

On iPhone Duo (iPhone19,4, iOS 27.2), reading ePassports via NFCTagReaderSession / NFCISO7816Tag fails reproducibly while the device is connected to Wi-Fi.
Access control (PACE) succeeds. During the following file reads (EF.SOD, DG2), one sendCommand call gets no response for about 2 seconds and then fails with NFCReaderError code 102 ("Tag response error / no response"). The failing command varies from run to run.

After disconnecting from Wi-Fi in Control Center, the same passport reads immediately. Disconnecting is enough; Wi-Fi does not need to be turned off.
The device lies still on the document in all attempts. ReadID Me, Regula Document Reader and our own app (KINEGRAM Digital Seal) all fail the same way.

Filed as FB25502333 with sysdiagnose and video.

This looks similar to the 2024 issue on iPhone 15 Pro / 16 Pro, where turning off Wi-Fi also helped:
https://developer.apple.com/forums/thread/765855

If you see this on an iPhone Duo too, please file a Feedback and reference FB25502333.

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DTS Engineer OP
Apple

@AxM

Thanks so much for filing the bug and providing the sysdiagnose and the video.

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Albert  WWDR