自定义帖子类型的WordPress sub_menu_page

Question

I would love to add a sub menu page on my custom post type called "vouchercodes", but everytime I click on this item in the menu I get "Sorry, you are not allowed to access this page."

I found some articels that "should" work:
https://developer.wordpress.org/reference/functions/add_submenu_page/ https://wordpress.stackexchange.com/questions/63202/how-to-add-a-sub-menu-page-to-a-custom-post-type

But none of those worked for me. I'm sure that I use an full administrator account and I haven't recived any error's in my error logs.

The code I use:

function sens_admin_add_submenus(){
    add_submenu_page('edit.php?post_type=vouchercodes', 'Custom Settings', 'Settings', 'manage_options', 'vouchercodes_settings', 'My_Custom_Callback');
}
add_action('admin_init', 'sens_admin_add_submenus');

And my simpel callback function:

function My_Custom_Callback(){
    echo "<h1>Welcome to my awsome setting's page</h1>";
}

What am I doing wrong?

---

Answer Fix from ishio :

Change admin_init to admin_menu

Answer 1

将add_action调用从admin_init更改为admin_menu将纠正此问题。