FishNet - Sync Var value not updating when build hosted online (works when using localhost)

Unity Engine
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1

Hey all,
I am hoping to get some help from anyone familiar with FishNet, the multiplayer networking solution.

I have created a basic script for decreasing a players health when the “R” key is pressed. FishNet recently updated to v4, and so SyncVars work a little different than before. I’ve clearly done something wrong as my clients health decrease as expected when I run builds locally, with a client on my localhost acting as both server + client, but when I do a build, and upload it to a hosting service such as Edgeware, the health doesnt decrease for either player.

Its a very basic script so Ill paste it below. Any help is appreciated. I have other scripts that do some basic things using Server and Observer RPCs. These work as expected, however I cant seem to figure out the sync vars.

using FishNet;
using UnityEngine;
using FishNet.Object;
using FishNet.Object.Synchronizing;
using UnityEngine.UI;



public class PlayerHealth : NetworkBehaviour
{
    public readonly SyncVar<int> health = new();
    Text healthText;

    public override void OnStartClient()
    {
        base.OnStartClient();
        if (!base.IsOwner)
            GetComponent<PlayerHealth>().enabled = false;
    }

    private void Awake()
    {
        gameObject.name = "Player:"  + InstanceFinder.NetworkManager.ClientManager.Clients.Count;
        health.Value = 100;

        healthText = GetComponentInChildren<Text>();

        health.OnChange += OnHealthChanged;
        
    }
    
    private void OnHealthChanged(int oldValue, int newValue, bool asServer)
    {
        healthText.text = "H: " + newValue;
    }

    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.R))
        {
            UpdateHealth(this, -1);
        }
    }

    [ServerRpc]
    public void UpdateHealth(PlayerHealth script, int amountToChange)
    {
        UpdateHealthText(script, amountToChange);
    }
    
    [ObserversRpc]
    public void UpdateHealthText(PlayerHealth script, int amountToChange)
    {
        script.health.Value += amountToChange;
    }
}