A Fastmail app specific passcode as backup if Touch ID fails is nice, but I don’t think it should be a strict requirement, as Fastmail could also fall back to the normal web login process in that case.
I have put in a feature request and got this response: "I'm afraid this is not on our immediate roadmap, however, we will take your suggestion on board in our future product planning.”
Anyway, thanks for the response Bill and good luck with your finger
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