Can Anyone Recommend a Multiplayer Hosting Service for the Quest?

I want to create a multiplayer app for the Quest, either in Unity or Unreal Engine, and don't expect that more than around 20 users would participate at any one time.  I've created an app with Unity and Photon (PUN 2) but have had problems accomplishing some of my goals (per my other forum discussions re inverse kinetics and background music syncing).  Can anyone suggest an alternative to PUN 2, preferably one that would not be too expensive?  Does Oculus have such a service?  Thanks for your assistance.