N/A means that Eurail can for some reason not reserve the trains you have to try different ways to reserve the trains

 

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Thank you @seewulf ,, however when I try reserve any train on the website, it’s just not allowing me too. On the app I can see the prices, but I can’t make reservations on the app. It’s just not working and I don’t know what to do…. It keeps on saying ‘the prices are temporarily unavailable’ on the website and this has been going on for 3 weeks now.

You need to read the link provided. There are other better websites to reserve seats in many European countries outlined in detail in that link, you are strongly advised to follow that advice.