Fix for space issue in username during WordPress reset password email link with the LoginPress - Hide Login Add-On.

retrieve-password-message.php

<?php
function loginpress_reset_password_email( $message ) {

  $user_data = '';
  
  // If no value is posted, return false
  if( ! isset( $_POST['user_login'] ) ) {
    return '';
  }
  
  // Fetch user information from user_login
  if ( strpos( $_POST['user_login'], '@' ) ) {
    $user_data = get_user_by( 'email', trim( $_POST['user_login'] ) );
  } else {
    $login = trim($_POST['user_login']);
    $user_data = get_user_by('login', $login);
  }
  
  if( ! $user_data ){
    return '';
  }
  
  $key = get_password_reset_key( $user_data );

  if ( is_wp_error( $key ) ) {
    return $key;
  }

  if ( is_multisite() ) {
    $site_name = get_network()->site_name;
  } else {
    /*
    * The blogname option is escaped with esc_html on the way into the database
    * in sanitize_option we want to reverse this for the plain text arena of emails.
    */
    $site_name = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
  }
  
  // Redefining user_login ensures we return the right case in the email.
  $user_login = $user_data->user_login;

  // Setting up message for retrieve password
  $message = __( 'Someone has requested a password reset for the following account:' ) . "\r\n\r\n";
  / translators: %s: Site name. /
  $message .= sprintf( __( 'Site Name: %s' ), $site_name ) . "\r\n\r\n";
  / translators: %s: User login. /
  $message .= sprintf( __( 'Username: %s' ), $user_login ) . "\r\n\r\n";
  //adding %20 for spaces in found in username
  $user_login = str_replace( ' ', '%20', $user_login );
  $message .= __( 'If this was a mistake, just ignore this email and nothing will happen.' ) . "\r\n\r\n";
  $message .= __( 'To reset your password, visit the following address:' ) . "\r\n\r\n";
  $message .= network_site_url("wp-login.php?action=rp&key=$key&login=" . rawurlencode($user_login), 'login');

  // Return modified complete message for retrieve password
  return $message;
}

// If LoginPress - Hide Login is activated.
if( class_exists( 'LoginPress_HideLogin_Main' ) ) {
  // Apply the reset_password_email() function on the "retrieve password" message:
  add_filter( 'retrieve_password_message', 'loginpress_reset_password_email' );
}