WordPress Cannot find site?

I’ve installed the plugin, changed a few settings and after saving, wordpress cannot find the site. I get the following errors.

The requested URL /wp-login.php?action=logout&_wpnonce=ecedea3ee4 was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

I removed the plugin via ftp, re-installled it, but same result.

Would love to use the plugin but it seems I cannot at the moment.

Any ideas?

Thanks

https://wordpress.org/plugins/two-factor-auth/