enable Usb Debugging

I'm using an automation platform that has an ADB session which requires the "device_serial_list", which is the serial number. However, if I do "adb get-serialno" I get a different value than the one shown in this website so I'm not sure what should be the one to use in this case.

the phone has a black screen and broken digitizer, for months it has been in the kids toy box and forgotten till i came across, a situation that coaxed me in to extracting the data with Dr fone , that's all well and good but only gave me sms pics and contacts . i need the saved emails and fb...