I tried yours manual togeather with manual made by Trezor team (some differencies, but same logic).
Both of these manuals resulting same error message.
What is more, I am teaching about Bitcoin and blockchain on university and actualy to create custom token was HW for my students. These students who returned HW few day before had no issue.
The problem is just approx last two days and nobady was able to solve it (every student has unique name and specs of her token).
We were able to solve the problem only by switching to Goerli testnet so probably the issue is in Ropsten testnet...