(BAD REQUEST) 400 admin-ajax.php error WordPress

Question

I updated my WordPress to current version as it was very outdated. And now I am getting a bad request browse issue now. /wp-admin/admin-ajax.php:1 Failed to load resource: the server responded with a status of 400 (Bad Request) browser pop up. This only occurs when user is not logged in admin.

I checked plugins and no issue there
I changed/ checked themes and the issue is within the theme code.

I isolated the snippets of code below … hopefully someone can see where the error is.

If the code needs to be edited can you please write it so I can copy and paste it and let me know where???
Thanks sooooo much!

Here are the 3 files that are conflicting:
autocomplete.js
functions.php
admin-ajax.php

Here is more info:

https://holisticlistings.com/ in browser’s developer console and only one URL throws 400 error

Request URL: https://holisticlistings.com/wp-admin/admin-ajax.php
Request Method: POST
Status Code: 400 Bad Request

Remote Address: 158.106.188.167:443

===

action: check_login_status

functions.php

    wp_enqueue_script('holistic_autocomplete', get_template_directory_uri().'/js/autocomplete.js',array('jquery'),true);
    wp_localize_script( 'holistic_autocomplete', 'holistic_ajax', array( 'ajaxurl' => admin_url( 'admin-ajax.php' )));
    wp_enqueue_script('holistic_jqueryui', 'https://code.jquery.com/ui/1.12.1/jquery-ui.js',array('jquery'),true);

autocomplete.js

jQuery(document).ready(function($){

        $.ajax({
            url: holistic_ajax.ajaxurl,
            type: 'POST',
            data:{
                action: 'check_login_status'
            },
            //dataType: 'json',
            success: function (data) {
              if(data == 'y'){
                 $('.memberlogin').css('display','none');
                 $('.memberlogout').css('display','block');
              }else{
                 $('.memberlogout').css('display','none');
                 $('.memberlogin').css('display','block');
              }
            },
            error: function (xmlHttpRequest, statusText, errThrown) {
                alert(errThrown);
            }
        });
    /*remove tick mark*/
    $('.table-body .table-row').each(function(){
        if($.trim($(this).text()) === ''){
            $(this).addClass('hide_before');
        }
    });


    var categories;
    var locations;
    /*categories*/
     $('#srchkey').on('focus',function(){
          $.ajax({
            url: holistic_ajax.ajaxurl,
            type: 'POST',
            data:{
                action: 'get_holistic_cat'
            },
            dataType: 'json',
            success: function (data) {

               categories = data;
               $('#srchkey').autocomplete({
                    source: categories
                });
            },
            error: function (xmlHttpRequest, statusText, errThrown) {
                alert(errThrown);
            }
        });

     });
     /*load locations*/
      $('#location').on('focus',function(){
          $.ajax({
            url: holistic_ajax.ajaxurl,
            type: 'POST',
            data:{
                action: 'get_holistic_locations'
            },
            dataType: 'json',
            success: function (data) {

               locations = data;
               $('#location').autocomplete({
                    source: locations
                });
            },
            error: function (xmlHttpRequest, statusText, errThrown) {
                alert(errThrown);
            }
        });

     });

});


admin-ajax.php

/**
 * WordPress Ajax Process Execution
 *
 * @package WordPress
 * @subpackage Administration
 *
 * Santu Links https://codex.wordpress.org/AJAX_in_Plugins
 */

/**
 * Executing Ajax process.
 *
 * @since 2.1.0
 */
define( 'DOING_AJAX', true );
if ( ! defined( 'WP_ADMIN' ) ) {
    define( 'WP_ADMIN', true );
}

/** Load WordPress Bootstrap */
require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );

/** Allow for cross-domain requests (from the front end). */
send_origin_headers();

header( 'Content-Type: text/html; charset=' . get_option( 'blog_charset' ) );
header( 'X-Robots-Tag: noindex' );

// Require an action parameter
if ( empty( $_REQUEST['action'] ) ) {
    wp_die( '0', 400 );
}

/** Load WordPress Administration APIs */
require_once( ABSPATH . 'wp-admin/includes/admin.php' );

/** Load Ajax Handlers for WordPress Core */
require_once( ABSPATH . 'wp-admin/includes/ajax-actions.php' );

send_nosniff_header();
nocache_headers();

/** This action is documented in wp-admin/admin.php */
do_action( 'admin_init' );

$core_actions_get = array(
    'fetch-list',
    'ajax-tag-search',
    'wp-compression-test',
    'imgedit-preview',
    'oembed-cache',
    'autocomplete-user',
    'dashboard-widgets',
    'logged-in',
    'rest-nonce',
);

$core_actions_post = array(
    'oembed-cache',
    'image-editor',
    'delete-comment',
    'delete-tag',
    'delete-link',
    'delete-meta',
    'delete-post',
    'trash-post',
    'untrash-post',
    'delete-page',
    'dim-comment',
    'add-link-category',
    'add-tag',
    'get-tagcloud',
    'get-comments',
    'replyto-comment',
    'edit-comment',
    'add-menu-item',
    'add-meta',
    'add-user',
    'closed-postboxes',
    'hidden-columns',
    'update-welcome-panel',
    'menu-get-metabox',
    'wp-link-ajax',
    'menu-locations-save',
    'menu-quick-search',
    'meta-box-order',
    'get-permalink',
    'sample-permalink',
    'inline-save',
    'inline-save-tax',
    'find_posts',
    'widgets-order',
    'save-widget',
    'delete-inactive-widgets',
    'set-post-thumbnail',
    'date_format',
    'time_format',
    'wp-remove-post-lock',
    'dismiss-wp-pointer',
    'upload-attachment',
    'get-attachment',
    'query-attachments',
    'save-attachment',
    'save-attachment-compat',
    'send-link-to-editor',
    'send-attachment-to-editor',
    'save-attachment-order',
    'media-create-image-subsizes',
    'heartbeat',
    'get-revision-diffs',
    'save-user-color-scheme',
    'update-widget',
    'query-themes',
    'parse-embed',
    'set-attachment-thumbnail',
    'parse-media-shortcode',
    'destroy-sessions',
    'install-plugin',
    'update-plugin',
    'crop-image',
    'generate-password',
    'save-wporg-username',
    'delete-plugin',
    'search-plugins',
    'search-install-plugins',
    'activate-plugin',
    'update-theme',
    'delete-theme',
    'install-theme',
    'get-post-thumbnail-html',
    'get-community-events',
    'edit-theme-plugin-file',
    'wp-privacy-export-personal-data',
    'wp-privacy-erase-personal-data',
    'health-check-site-status-result',
    'health-check-dotorg-communication',
    'health-check-is-in-debug-mode',
    'health-check-background-updates',
    'health-check-loopback-requests',
    'health-check-get-sizes',
);

// Deprecated
$core_actions_post_deprecated = array( 'wp-fullscreen-save-post', 'press-this-save-post', 'press-this-add-category' );
$core_actions_post            = array_merge( $core_actions_post, $core_actions_post_deprecated );

// Register core Ajax calls.
if ( ! empty( $_GET['action'] ) && in_array( $_GET['action'], $core_actions_get ) ) {
    add_action( 'wp_ajax_' . $_GET['action'], 'wp_ajax_' . str_replace( '-', '_', $_GET['action'] ), 1 );
}

if ( ! empty( $_POST['action'] ) && in_array( $_POST['action'], $core_actions_post ) ) {
    add_action( 'wp_ajax_' . $_POST['action'], 'wp_ajax_' . str_replace( '-', '_', $_POST['action'] ), 1 );
}

add_action( 'wp_ajax_nopriv_heartbeat', 'wp_ajax_nopriv_heartbeat', 1 );

$action = ( isset( $_REQUEST['action'] ) ) ? $_REQUEST['action'] : '';

if ( is_user_logged_in() ) {
    // If no action is registered, return a Bad Request response.
    if ( ! has_action( "wp_ajax_{$action}" ) ) {
        wp_die( '0', 400 );
    }

    /**
     * Fires authenticated Ajax actions for logged-in users.
     *
     * The dynamic portion of the hook name, `$action`, refers
     * to the name of the Ajax action callback being fired.
     *
     * @since 2.1.0
     */
    do_action( "wp_ajax_{$action}" );
} else {
    // If no action is registered, return a Bad Request response.
    if ( ! has_action( "wp_ajax_nopriv_{$action}" ) ) {
        wp_die( '0', 400 );
    }

    /**
     * Fires non-authenticated Ajax actions for logged-out users.
     *
     * The dynamic portion of the hook name, `$action`, refers
     * to the name of the Ajax action callback being fired.
     *
     * @since 2.8.0
     */
    do_action( "wp_ajax_nopriv_{$action}" );
}
// Default status
wp_die( '0' );

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