Just tried on Firefox Windows 10 and nothing. Same problem. Tried on my phone and it won't even let me login because the site is not formatted properly for mobile. Tried it on my tablet in Desktop mode, and got the same error message.
The only thing I can think is because they changed my address on file themselves before they had this interface, it's not letting me change it back. If I could get someone from NQ to reply or at least email me about this, it could all probably be sorted out in a few minutes. Unfortunately, they don't seem to care about their founders because my emails, and as you all can see, this post, goes unreplied.