Reading thru this section of Q/A I believe I cannot book seat reservations via the Eurail site, without FIRST activating my pass. Some have said to book reservations directly on the specific train site, but when I tried to do that for SBB.ch, it didn’t give me a section to show my 1st class Eurail pass, so it wanted to change me a huge price for the seats. So I went back to the Eurail site to activate my passes, since I am 99.9% certain of my first day of train travel. The Eurail site wouldn’t let me activate it online...with the message that I can only activate an online pass at the time of purchase OR in person at a train station.
Am I understanding this correctly?? Thank you in advance