Did you get the Raspberry Pi from us? I’m curious as to what software/OS is running on it. If the SD card is blank or corrupted then you won’t be able to ping it, so maybe try flashing the companion image directly onto the SD card, or try using a different SD card if flashing the current one doesn’t work? A starting point would be connecting the SD card to your computer and seeing if it gets detected (if not then it’s likely corrupted).
Alternatively if you’ve got a monitor and HDMI cable available you can connect that to the RPi and see what text appears when you power it on. If it’s saying things like Opening /dev/serial/by-id/... at 115200 bps then it’s got a companion image on it and something else is the problem. If it ends with raspberrypi login: it should at least have a valid image installed, but may need to enable ssh (or you could just flash the companion image as mentioned above). If nothing comes up at all then you likely need to flash an appropriate image onto the SD card, or need to replace the SD card if that one’s corrupted.
Also, if you didn’t get it from us, which model of Raspberry Pi are you using? We currently only fully support Raspberry Pi 3B, and that’s what our images are made for.