Mike Fitzgerald wrote:
We are travelling on the Eurostar today on a later time than expected. We have reservations for the correct train but it won’t allow me to add it to the pass as it says I have used up the outbound stage - but obviously we haven’t- it won’t let me change
Please go into My Trip and check all dates where it says "Out/In” next to the date. The message you saw suggests there should be 2.
If those dates are in the past, did you indeed travel in the UK on both of those dates?
If at least one is in the future, then you can remove it from your pass.