Connecting main GPS to Pixhawk 4's UART & I2C B port

Hi, I’m using a Pixhawk 4 and I’d like to connect my main GPS to its UART & I2C B port. I have set GPS_1_CONFIG to TELEM/SERIAL 4 (104) but I then failed to get any GPS reading. Should I instead set the parameter to GPS 2 (202)?

I’m attaching a link to my parameter file on Google drive.