"daqregister" is an old way of registering and using Analog devices within MATLAB. This functionality has been removed since MATLAB R2016a. Since the newer release, you do not need to register an adaptor (which is what "daqregister" was used for) if you are using session-based interface. If you are using newer release, I recommend setting up your device by following the steps as described in the documentation here:
https://www.mathworks.com/help/daq/hardware-discovery-and-session-setup.html
I also recommend going through this short video if you are looking to integrate a gamepad controller with a Simulink model.