Jokko453Htyhj we have a few other people report that issue but when we got the kits back and tested on an EZBoard here we couldn't replicate the issue. I suspect it has to do with wiring going between the sensor board and the EZBoard. If the Z endstop cable is working with the Z endstop switch then the endstop itself is working correctly on the EZBoard. I would recommend shortening the cable to cut down on any EMI that could be interfering with the cable signal.
If you want to verify if the EZABL board is working you can do a continuity test across the z endstop side while triggering the sensor. It should read under 200 ohms of resistance across the z endstop side. If you get no reading swap the probes like you would do on the z endstop cable (or if you have the pro flip the Z switch on the Pro board).