Activating Select Eurail Pass at small train station?

I have a Four Country Select Pass, active for 10 days. I've traveled already to some small towns in Italy, but I didn't think it was worth it to activate the pass yet. I will have a big travel day in the next few days, but I'll be starting out from a small town in Italy, where there is only a machine to buy tickets and no ticket desk or staff. Can I activate it somehow? Or do I need to buy a separate ticket to a main station to get it activated?
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