Exporting the glb from unity has bad lighting

[PaulYoSwek]

I'm exporting a dynamically created object from my unity scene.
But in the created .glb file the object looks nothing like in the scene, the lighting is way of.

my code:

 public async void AdvancedExport(uint _currentCreationId)
    {
        fileName = UnityEngine.Random.Range(0, 9999999).ToString();

        currentCreationId = _currentCreationId;

        var exportSettings = new ExportSettings
        {
            Format = GltfFormat.Binary,
            FileConflictResolution = FileConflictResolution.Overwrite,
        };

        var export = new GameObjectExport(exportSettings);

        var rootLevelNodes = GameObject.FindGameObjectsWithTag("ExportMe");

        export.AddScene(rootLevelNodes, "My new glTF scene");

        var outStream = new MemoryStream();
        bool success = await export.SaveToStreamAndDispose(outStream);

        Debug.Log("Success: " + success);

        if (!success)
        {
            Debug.LogError("Something went wrong exporting a glTF");
        }
        else
        {
            StreamToBytes(outStream);
        }
    }

Unity scene looks like:

and the .glb file looks like:

The reason why the red bricks are white is because I was trying a shader given by this glb plugin shown in image below

Thought that might fix the weird lighting but no.

Anyone has any idea what I'm missing?