It says everytime that the Embed is not specified. But the message has an embed...
await msgc.UpdateAsync(x =>
{
x.Embed.Value.ToEmbedBuilder().Description = $"**\\:white_check_mark: Correct**\nYou answered: {((ButtonComponent)msgc.Message.Components.First().Components.First(x => x.CustomId == Moby.ColorQuizCorrectAnswerCId)).Label}";
x.Components = new ComponentBuilder().Build();
});