When two-factor authentication is on, login needs the code from your authenticator app. A password reset does not turn 2FA off.

First try to restore the app. If you saved the key shown when you turned 2FA on, add it to an authenticator app on any phone. If your app has a backup or sync, restore it on the new phone. The codes will work again.

If that is not possible, request a reset of two-factor authentication:

On the login page enter your email and password. On the step with the authenticator code, click No access to the authenticator app?. If you are logged in, the same link is under the code field of the confirmation forms and next to two-factor authentication in Account → Security.
Click Send code to email and enter the code from the email.
Verify your identity: click Verify identity and take a selfie. It is compared with your earlier identity verification. If your account has not passed identity verification yet, you pass it now: it is the check for the reset.
Wait. The reset happens not earlier than 48 hours after the request, and only after support confirms it. We email you right away and again shortly before the reset.

A request that is not finished closes by itself: if the identity check is not done within 14 days of the request, or support has not decided within 30 days after the earliest reset time. If you still need the reset, start a new request.

After the reset you are logged out of all devices, your API keys are disabled and withdrawals are blocked for 72 hours. Log in with your password and a code from your email, then turn two-factor authentication on again in Account → Security: How do I turn on 2FA?

If you did not request the reset, someone knows your password. While a request is open, a notice about it is shown at the top of every page of the site with Cancel request. Or click It wasn't me in our email: you can only cancel the request or also freeze your account (How do I freeze my account?). Then change your password.

If the identity check does not work for you, write to us through the support form. Do not send photos of documents, passwords or codes by email or in the form: we never ask for them.

To avoid this in future, keep the key offline in a safe place, separately from your phone.

Stay safe: Strade support never asks for your password, 2FA codes or seed phrase. People who offer to "unlock" your account for a fee are scammers.

I lost access to my authenticator app