Shoojoabee17 We can not figure out how to book the train from Spiez to Milano and then Milano to Florence with are Eurail pass
The first problem is the Eurail Pass. You cannot book with Eurail Pass on SBB, or Trenitalia.
You can book this on Rail Europe, but there you run in to the second problem, that the booking system often suffers from hallucinations on that route. Or try on Rail europe in a few days. Those hallucinations often pass.
International train travel is complicated. Tuis is by design, as obviously the railways want you to travel by Flixbus in stead.