Open a new commandline (Windows + R → cmd.exe). Then change-directory (cd) into your PlatformIO’s openocd installation
cd .platformio\packages\tool-openocd
Then just execute the OpenOCD command that PlatformIO would to connect to the chip
bin\openocd -s scripts -f interface/stlink.cfg -c "set CHIPNAME at91sam3X8E; set CPUTAPID 0x2ba01477" -f target/at91sam3ax_8x.cfg
What does just that output?