Woocommerce my account custom page - page not found 404 (permalinks problem)

Question

I'm trying to create a custom page in My Account section of Woocommerce, but when I open this page I get 404 (Page not found). I tried to re-save (refresh) the permalinks in Settings -> Permalinks, but nothing changes (again 404 - Page not found). I'm using this permalink type "https://mywebsite.com/sample-post/". When I change the permalink type to "https://mywebsite.com/?p=123" it is working and the page shows. Can somebody tell me where is the problem and why it's working with "Plain" permalinks, but it's not working with "Post name" permalinks? Here is my code snippet:

// 1. Register new endpoint to use for My Account page
// Note: Resave Permalinks or it will give 404 error
  
function bbloomer_add_premium_support_endpoint() {
    add_rewrite_endpoint( 'premium-support', EP_ROOT | EP_PAGES );
}
  
add_action( 'init', 'bbloomer_add_premium_support_endpoint' );
  
  
// ------------------
// 2. Add new query var
  
function bbloomer_premium_support_query_vars( $vars ) {
    $vars[] = 'premium-support';
    return $vars;
}
  
add_filter( 'query_vars', 'bbloomer_premium_support_query_vars', 0 );
  
  
// ------------------
// 3. Insert the new endpoint into the My Account menu
  
function bbloomer_add_premium_support_link_my_account( $items ) {
    $items['premium-support'] = 'Premium Support';
    return $items;
}
  
add_filter( 'woocommerce_account_menu_items', 'bbloomer_add_premium_support_link_my_account' );
  
  
// ------------------
// 4. Add content to the new endpoint
  
function bbloomer_premium_support_content() {
echo '<h3>Premium WooCommerce Support</h3><p>Welcome to the WooCommerce support area. As a premium customer, you can submit a ticket should you have any WooCommerce issues with your website, snippets or customization. <i>Please contact your theme/plugin developer for theme/plugin-related support.</i></p>';
echo do_shortcode( ' /* your shortcode here */ ' );
}
  
add_action( 'woocommerce_account_premium-support_endpoint', 'bbloomer_premium_support_content' );
// Note: add_action must follow 'woocommerce_account_{your-endpoint-slug}_endpoint' format

Answer 1

Could you please go to Settings -> Permalinks and try to re-save it and check again.