When I continue payment it show “Sorry, something went wrong. Please try again later or find another connection. This connection will be removed from your cart.” How can I book seat reservation?

When I continue payment it show “Sorry, something went wrong. Please try again later or find another connection. This connection will be removed from your cart.” How can I book seat reservation?
Best answer by rvdborgt
That train is fully booked. No reservations available, not even on the mandatory part Padborg-Flensburg.
Travel 2 hours later with a change in Flensburg, no reservations needed.
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