I was also able to connect with the UART Passthrough with this command to turn the beep off. I found the UART Passthrough exe somewhere in the Forum.
UPDATE: UART Passthrough link https://drive.google.com/file/d/1xtOKgJPVTym-rJvgQYRr6yYUXkxCFZvp/view
MCU+PAS+RAKOIT:BEP:0&
Hope this helps.