Apple Watch Series 4 on the Tube

[redshift]

Here you go:

@Rika

To answer the original question though, after some investigation over the last couple of months, this is an issue between the TfL readers and the Apple Watch. Specifically, if you present your Watch to the gate too soon after selecting a card and/or pull it away too quickly, this error code can occur.

71 and 94 are practically interchangeable when dealing with Apple Pay and our best guess at this stage is that somewhere, the reader is initialising with the Watch and failing before the payment application on the Secure Element is selected and has responded. This seems to jam the Watch until you back out and re-arm Apple Pay.

It’s not an issue exclusive to Monzo but is something we’re tracking and trying to investigate. It seems exclusive to the Apple Watch Series 3 and 4. It does not occur on any other devices we’ve seen.

The fix seems to be to arm Apple Pay ahead of time and to not wave your wrist too fast on the reader.