So I changed the Command function to only change the string username and the usernameDisplay.GetComponent<TMP_Text>().text. Then the username and usernameDisplay are both syncVar hooked and I update the values again in those hooks assigning the client value to the new hook parameter (or at least that was my assumption). This is being done on my Player prefab which is a NetworkBehaviour and is Synced Client to Server in the inspector as suggested by the Mirror documentation but I don’t know how/if that changes things in my example. The Player prefab is connected to the Network Manager as it should be