> [1844912.295495] usb 5-2: pl2303 converter now attached to ttyUSB1
>
> And they still wont talk to eachother

You've selected Yaesu FT-8900 in the chirp clone settings dialog, right?

You hit okay on that box and then hit the button to start the TX on the
radio side, is that right?

Did you have the radio at the clone screen before clicking okay,