If you can't log in, then probably your login information is wrong.
-snip-
There is no way, 2FA active itself without being active by the use you only have few scenario:
- You just forget active 2FA by yourself
- Got phishing/hacked and the person who phishing you activated 2FA.
Anyway, web wallet is also one of the dangerous place to access or created a wallet cause while creating or login you are actually online and potentially got phishing, cryptocliper and your device got malware which has potentially expose creditial information.