Error Code 401

[Semaphore1842]

I'm also experiencing this problem. Every time I try and enter my details, it just comes up with a 401 error, tells me to 'make sure I check all appropriate details' and takes me back. Would have been nice to have been told you were banning my credit card for a month instead of a cryptic error message beforehand, SE.

You're making the mistake of assuming SE wants to be nice to you. They don't. They are a troll corporate-personified trying to see just how far they can screw with their customers before they lose them.