This session has timed out for your security.

I have exactly the same issue.

I can not log in to https://appleid.apple.com/

When I provide valid credentials, I'm asked, if I allow access from the geo location and then with 6 digits. When providing the verification code (the digits), the page then presents the mentioned warning.

This is a serious blocker for me, because I need app specific passwords.

How one would remove 2FA ?

Thanks!

My problem has not been solved, and it has been 3 weeks since your original post. When I attempt to login to appleid.apple.com, successful authentication notwithstanding I get the message: "This session has timed out for your security." Every time, from every browser (Chrome, Firefox and Safari).

I had this same problem, and it turned out to be one of my Safari Extensions. If you're having this problem, turn off all of your Extensions (In Safari>Preferences>Extensions) and try again. If it works, re-enable them one at a time until it fails, and then you'll know the culprit. For me, it was the Reading (reading.am) extension.

This still doesn't work for me, I cannot even create a new Apple ID, tried from different devices as well...

You might want to consider starting a new discussion. Since this one is marked solved, less people are likely to look at it. A new post would be much more visible. You can link to this one.

there is a contact link.

Apple ID Support

Apple ID Support (2)

Apple Support by e-mail or chat Select your device, Battery, Power and Charging, then Power adapter not working to get a chat option. If you need to talk to them, ask them if they will do a Skype or FaceTime with you.

Apple Support using Twitter

Or fill out and submit this form.

OMG man, you've restored my life-force. I was in the middle of adding a few devices to my DEP account, which requires you to login to the DEP web portal after enrollment and then move the device to your DEP server. All of a sudden, it gets stuck in a 2FA loop, entering the SMS code, then back to 2FA. I went to Apple's Service Status website (consumer services as well as developer) and nothing was indicated as down. I freaking had to bail on my valentines day with the wife and kids, stuck at my clients office until a had to give up. I was browsing the web like crazy, finally stumbled on this thread and realized your posting date, f***Ing eureka man, I'm not just going crazy. Thanks for getting that support call in and posting my man! My clients aren't going to be happy waiting a few days, but they're used to this stuff with the iDevices by now.

See the very last section of this article.

Apple ID -Two-factor authentication

I cannot test because I do not use 2FA...

I can login successfully after being challenged with security questions

I would Contact Apple Support if I were you

They told me that the apple engineers know about it as well. They told me that it should hopefully be dealt within a few days.

You are welcome. I was referring to the section about turning it off and the restrictions on being able to do that.

Thank you for the feedback from Apple.