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Currently, there isn't an easy out-of-the-box multiplayer solution on HoloLens. Implementing multiplayer games with ASA and Photon is the right direction.
ASA provides detailed documentation to get you started, please refer to Tutorial: Create a new HoloLens Unity app - Azure Spatial Anchors | Microsoft Learn. HoloLens also provides a Photon-related tutorial, which can help you get started quickly, please refer to Introduction to the Multi-user capabilities tutorials - Mixed Reality | Microsoft Learn. For more information about Photon, you can visit the Photon Engine official website.
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