Has this specific drive & cable setup ever worked on this particular laptop before? If so, has anything changed recently to the hardware or software?
Is the drive connected directly to the laptop? Have you tried using another USB port especially on the other side of the laptop? What adapter and/or cable are you using?
Make sure to disconnect all other external devices from the laptop in case one of them is interfering.
Are you using the WD proprietary software to manage the drive?
What version of macOS are you running? You can get this information by clicking the Apple menu and selecting "About This Mac". Make sure macOS is completely up to date for the version of macOS you are using.
Within Disk Utility you may need to click "View" and select "Show All Devices" in order for the physical drive to appear on the left pane of Disk Utility. Does the physical drive or WD enclosure appear listed on the left pane of Disk Utility after doing this?