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Advice with Train tickets Riomaggiore to Florence SMN

First time to Italy. I've been trying to buy train tickets for June 11th, Riomaggiore to Florence SMN for about a week. Trenitalia and RailEurope both say nothing is available. Is there a different query I should be using? Am I too early or too late? Should I book from a different station in CT? I've managed to buy tickets from Venice to Riomaggiore on Trenitalia. Thank you!