Thank you, just panicking they will all be sold out!
Possible to book here for 3€ per person: https://shop.oebbtickets.at/en/ticket (without booking fee; so it's much cheaper). As there is no date shown in your screenshot: DB system does sell reservations six months in advance. So last possible day here: 15.7. (maybe that's the problem). Thank you for this. Annoyingly it says tickets are unavailable on the dates I want - 15-17th June, London to Duisburg.
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