Solution
Some components in Multisim are layout-only, meaning that there is no SPICE model being used to simulate the component. Multisim simulates a layout-only component as an infinite impedance, so as to not affect any simulated circuit.
Layout-only components appear in green on the schematic diagram.
If you need to include a layout-only component in a simulation, you will need to find a SPICE model for that component. These can usually be found on the Manufacturer's website. You can then
import this SPICE model into Multisim.