I found two excellent resources that showed me how to do this.
Microsoft Tutorial – https://docs.microsoft.com/en-us/samples/microsoft/mixedreality-unreal-samples/hl2collab—hololens-multiplayer-networking-in-unreal/
Unreal Engine Multiplayer docs – https://docs.unrealengine.com/5.0/en-US/networking-and-multiplayer-in-unreal-engine/