I've not come across this error before. Here is the code from the Trezor plugin for Electrum which is throwing this error: https://github.com/spesmilo/electrum/blob/4aa319e5c31543883346e28a5459fa3642601be6/electrum/plugins/trezor/trezor.py#L84

As it says, it can't find the UTXO for the input you are trying to spend. How have you created this transaction you are trying to sign? Are you sure it is a valid transaction?

Secondly, make sure the Trezor is up to date, and also ensure that you have the correct wallet open on the Trezor. Did you use a passphrase when setting up the wallet and have forgotten to enter it this time?

There have been a number of problems in the past with Trezor devices and multi-sig in the past, so this might be nothing you are doing wrong but rather a problem with Trezor.