Could you try to clear your browser cache and retry to see if it works, if not you could also try using a vpn to change your proxy which could do the trick most of the time, if still not after trying those then the problem is with them and not you
I have already tried that method. I STILL get the error message.
I also tried accessing with a different IP address and still no success.
I honestly think the site is broken. Seems like there has been issues logging into the site the last month. Support is an utter joke.