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I don’t understand. Don’t type in anything (especially your seed phrase). Can you share the Tresor page you mentioned?
Edit: I found the page. Have you enabled the passphrase feature? If not, you don’t need to enter anything. If yes, I think you can enter it as the passphrase alone is not enough to get your private keys (for that, also the seed is necessary and the SEED you never enter anywhere except on your Trezor T).
As I understand it, the passphrase is just used to tell your Trezor which of you wallets should be connected to the application in question.
Edit 2: See passphrase explanation here: https://wiki.trezor.io/Passphrase