Using Steamworks.net with Mirror - could not resolve host

hello, sorry if this is a stupid question I’m fairly new to unity

I tried combining “steamworks” with mirror using a tutorial I found online and faced the following error:
“could not resolve host [steam user ID]”

Code:

void OnLobbyCreated(LobbyCreated_t pCallback)
    {

        networkManager.StartHost();

        SteamMatchmaking.SetLobbyData(
            new CSteamID(pCallback.m_ulSteamIDLobby),
            "address",
            SteamUser.GetSteamID().ToString()
        );

    }

void OnLobbyEntered(LobbyEnter_t pCallback)
    {

        if (NetworkServer.active) { return; }
        string hostAddress = SteamMatchmaking.GetLobbyData(
            new CSteamID(pCallback.m_ulSteamIDLobby),
            "address"
        );

        networkManager.networkAddress = hostAddress;
        networkManager.StartClient();

    }

@dabigmahmoud
Make sure, that you use the specific steamwork script for transport. As for me, I used FizzySteamworks.