ESC not connecting after flashing Kakute H7 mini with Ardupilot, Mission Planner

Hi,
As a research project, we are trying to flash a Holybro Kakute H7 mini with Ardupilot, Mission Planner. Now the Tekko32 F4, 4in1 mini speed controller is not recognized and will not calibrate/arm. Any help would be greatly appreciate it.

Best,
Reza