Issue: RealSense Viewer or other Windows camera apps do not recognize the Intel RealSense D415 or D435 Depth Cameras.
Cause: Windows driver for the Intel® RealSense™ D415 and D435 Depth Cameras does not install correctly.
To uninstall camera drivers
4. Select box for "Delete the driver software for this device."
5. Uninstall device under "Universal Serial Bus devices."
6. Uninstall device under "Cameras."
7. Reboot the PC and/or disconnect and reconnect the camera to the same or different USB 3 port.
If these workarounds don't work you may have a faulty camera that needs to be replaced.