Mogstation, setting up subscription, error code 601 shenanigans

[Blaize]

I remember having this same error code when trying to register my Visa debit card in the SE Account Management System last year when SE added direct billing - it turns out my issue was simply my browser. I was accessing the page through Firefox with the Noscript addon, which was blocking a benign security script from running in the background (which verifies your card details when you enter them). Disabling Noscript fixed the issue.

^^

This!

It was the only thing causing my 601 Error when I had it....damn crazyness!