We want to go from Hamburg to Amsterdam on 18-Jun-2023. When searched on the eurail reservations
found the below option (with one change) found a train

After choosing the seat reservations -got the below screen

when I tried to add checkout, it get stuck at the ‘add traveller’ details. Nothing happens when I click on it. It has been the case from the begining. I tried to create a new trip with only 3 travellers (thought the issue was with 7 travellers), but still it get stuck.

Thanks in advance for your help.