sjwt

Thanks for letting me know the problem is not unique to me.
I spent some time a few days ago and have figured out the issue.
After login, the plugin will try to redirect the page to wp_get_referer().
However, I don’t know why that function returns a empty string.

Here is my workaround.
Edit the file: wordpress-2-step-verification/wordpress-2-step-verification.php
Modify the function: code_check_ok() to following

function code_check_ok(){
        $remember=$this->post('wp2sv_remember');
        $this->cleanup_restriction();
        $this->auth->set_cookie($this->user_id,$remember);
        if ( wp_get_referer() ) {
    		wp_safe_redirect( wp_get_referer() );
	} else {
    		wp_safe_redirect( get_home_url().$_SERVER["REQUEST_URI"] );
	}
	exit;
        die;
 }

Essentially the workaround just tries to use another approach to get a redirect url if the wp_get_referer() is empty. It works well for me.