STM32 ST-LINK Utility will not connect to the target.

I want to flash the rt1052 bin onto a DigitalDream EC300 ethernet controller board. The controller board has an MIMXRT1052 chip. I'm using the STM32 ST-LINK utility running on Windows 11. I've connected the pc to the board via an ST-Link V2 emulator. When I try to connect to the target in the utility, I get the error "Cannot connect to the target!". I've tried the Connect Under Reset and Hot Plug modes to no avail. The EC300 board is powered externally by a 24Vdc supply. I've connected the board to the ST-Link V2 using 3 pins as marked in the picture. What am I doing wrong?