Your BLTouch should be on, with a solid red light. If it's flashing, power off and check its wiring.
Run the following gcode in the console in duet web control:
M280 P3 S10
The pin on the bltouch should lower. (Look across the nozzle of your hotend at the pin, it should extend below the nozzle, this is important for leveling!)
Tapping the pin lightly with your fingertip should cause it to retract, then drop back down.
Running the following gcode should retract the pin again:
M280 P3 S90
The Z Probe value in the duet web control should read zero.
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