Having Two bookings at the same time

Have you checked that the time difference is not because of timezones?

On the benefits page it is described how to book it. (but with a global pass it is not much of a discount if i remember correctly)

https://benefitsportal.eurail.com/benefits/attica-group-greece-italy-superfast-ferries-in-cooperation-with-anek-lines/

I have no experience with the ferries between greece and italy on how long it takes to get off and to the train station (but on my ferry from poland to sweden it took quite some time to get off and they even checked id/passport  and took a look at the luggage of some of the people.)

Hi Marvin, thanks for responding.  I don't think it's a time zone problem causing the error message as I don't get as far as choosing the ferry, I've only chosen the date.

It could absolutely be a timezone issue with the arrival time! I can't book the ferry, so the times I'm getting are from various pages and I don't know which one is most up to date.  I think I'll just book the later train. Thanks for the info.

If you are looking at one of the ferries operated by superfast this is the official site: https://www.superfast.com/en-gb/ 

What kind of train are you booking, as some of the reservations in italy can be changed free of charge (in case you are earlier then planned at the station and the train is not booked out)

The ferry in is at 10.00 am according to superfast.com. I can get as far as to choose cabins. I always book it at superfast.com