Send transaction not possible on Trezor / Sys Electrum

Hi - I have updated the latest firmware on Trezor, signed with Trezor One on Sys Electrum, chose native segwit.

I was able to receive SYS but I am unable to sign the transaction to send SYS. It says : key error

Refraining from uploading the screenshot in case it contains sensitive info.

Could use some help in being able to move my coins.

Thanks in advance,
Monis