Hi, I am trying to book a seat reservation on the Eurostar - London to Paris for the 28th of Aug. But for some of the time slots it gives me an error message and I cannot book those ones. Why is it not possible to book some of the time slots, when those trains are definitely running as per the Eurostar website?
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Because Eurostar offers just limited seats for Railpass user like Interrail/Eurail if these seats are sold out there is no option to use the train with Interrail/Eurail 
You still could buy a Individual Ticket for Eurostar but these prices vary on demand and last minute prices are often quite high Before they sell a seat for Interrail/Eurail user they prefer to let the seat free :/
You could try it here once more
https://www.b-europe.com/EN/Booking/Pass#TravelWish
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