Which trains are you trying to make reservation for? Usually there are easier places to do it than through Interrail. There is good guide to how and where to make reservations here and also on the excellent Seat61 site https://www.seat61.com/interrail-and-eurail-reservations.htm For example the IC103 between katowice and Wien on the 16/06/2023 thank you for the links
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