Cant send messages through UART on Xavier NX

I am try to connect my Xavier NX through the UART.
I set the BAUD on both sides of the pipe and I am getting data through it but can’t send any data.
replaced the wires few times but still no luck
I am getting data through THS0 but can’t get anything through S0.
also tried to put a jumper between the tx/rx and run a script writing and reading from the ports but I am not sending anything.
any idea?

hello omer.porat,

may I know what’s your pin connections,
please also check these see-also topics for reference,