Doubt megaclientapi HELP

Hello, I have an application in C# using MegaApiClient and it's working normally but when I upload a file it blocks the account and says to change the password and I can't solve it for a while, will you be able to help me solve this problem.

 private async Task UploadArquivo(string pArquivo)
        {
            listStatus.Items.Clear();

            MegaApiClient MClient = new MegaApiClient();

            listStatus.Items.Add(DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss") + " Iniciando...");

            try
            {
                /*--------------Upload--------------*/
                MClient.Login("cristi676767ano@gmail.com", "*********");

                if (MClient.IsLoggedIn)
                {
//upload.
				}
			}
		}