Last weekend, I've received issues of Error 401 as well. I've waited a while and tried again, repeating the process, but it still didn't work. So I tried using a different card for method of payment. Didn't work as well. I'm unable to purchase anything from the Mogstation, I can't purchase Crysta, I'm also unable to purchase anything from the Square Enix Online Store as well. Getting really disappointed with this.