Use this instead of that

JsonDeserialize.cs

private async Task<TModel> JsonDeserialize<TModel>(HttpResponseMessage response)
{
    var content = response.Content;
    using var stream = await content.ReadAsStreamAsync().ConfigureAwait(false);
    using var reader = new StreamReader(stream);
    using var json = new JsonTextReader(reader);
    return serializer.Deserialize<TModel>(json);
}