Hi there,
Have you utilized any particular authentication or 2FA plugin? If you have, kindly provide the name of the plugin, and the most effective approach would be to submit a support ticket on the support forum for that specific plugin on the WordPress.org plugin page. Thank you.
What exactly causes the login to fail? What error message do you see?
If it is an incorrect password, reset it. If you do not receive an e-mail, you can also reset the password manually as described here: https://wordpress.org/documentation/article/reset-your-password/#through-phpmyadmin
I know the password, I am unable to access the authorization code sent to the authenticator.
Sorry for the late response.
So you use a 2FA to log in? This is not part of WordPress. You have to use a plugin for this. To bypass the 2FA, you would have to remove the directory of the responsible plugin via FTP.
I can’t tell you which plugin it is without knowing the project. You could take a look at the list of directories in /wp-content/plguins/ via FTP and see which one looks familiar to you.
Your hoster’s support can tell you how to connect via FTP.