Hello,
2-Step Verification (also known as 2 Factor Authentication) is an optional system in which you can add an extra layer of security to your account by taking advantage of components that are unique to oneself. You can find a full guide on how to enable it on your account
here (Thanks Cain!)
If you are having a problem accessing your account due to two step verification, I'm afraid the forum staff are unable to help you remove this from your account. Check below on how best to resolve this issue:
If you have your recovery codes:
Visit
https://account.ubisoft.com/ and login to your account, using one of the 6 recovery codes you received when setting up two step verifcation on your account.
These codes are quite obviously fake and will not work on your account
From here you can disable two step verification and re-enable it on your new device if you desire to do so.
If you have lost/don't have access to your recovery codes:
You will need to contact the support team who will be able to remove it from your account. You can then choose to re-enable it if you wish. You can reach them in a number of ways:
Webmail:
https://support.ubi.com
Phone:
https://support.ubi.com/en-GB/Contact
Twitter:
https://twitter.com/ubisoftsupport
Facebook:
https://www.facebook.com/UbisoftSupport/
Note: When contacting the team on social media please send a Direct/Private Message
They will ask for some details to prove that you are the account owner, be prepared to provide any game activation keys tied to the account and any personal details listed, even better, provide these when initially creating your ticket to help speed the process up.
If you have no knowledge of setting up two step verification on your account:
Your account may have been compromised, please contact the support team as above as soon as possible.