FWIW I have a similar problem with my AUKey USB C hub model CB-C71. The symptom was that my keyboard (a fairly old wired USB Microsoft Natural Keyboard) and mouse (Logitech B100), both of which are connected via an ezcoo KVM swtch, were not recognized (or even powered).
Moving the KVM switch to a different USB port on the AUKey hub solved the problem for me (the one opposite of the USB-C power port). The other two USB ports on the hub don't seem to work for any peripheral I have.