In message , Clive Page
writes

I have no idea whether the fault is with FCC for not encoding the
tickets correctly (as the EMT barrier man said) or with the other train
companies failing to recognise this fairly new type of ticket. The
rejection code, I think, is 105.

I thought Oyster error codes are all double digits. Very few end in 5,
but 05 is "engineer signed onto machine" and 15 is "no onward validity".
--
Paul Terry