i created a custom post tpye

function ABECrm_post_type() {

    $labels = array(        
        'name'          => __( 'Agenden', 'ABECrm' ),
        'singular_name' => __( 'Agenda', 'ABECrm' ),        
        'add_new'       => __( 'Neue Agenda', 'ABECrm' )        
    );
    $args = array(
        'label'                 => __( 'agenda', 'ABECrm' ),
        'description'           => __( 'Hier werden die Agenda-Seiten eingetragen', 'ABECrm' ),
        'labels'                => $labels,
        'supports'              => array( 'title', 'editor', 'custom-fields', 'page-attributes' ),      
        'hierarchical'          => true,
        'public'                => true,
        'show_ui'               => true,
        'show_in_menu'          => true,
        'menu_position'         => 20,
        'show_in_admin_bar'     => true,
        'show_in_nav_menus'     => true,
        'can_export'            => true,
        'has_archive'           => true,
        'exclude_from_search'   => false,
        'publicly_queryable'    => true,
        'capability_type'       => 'page',
        'show_in_rest'          => true,
        'rewrite'               => array('slug' => 'Schulungen'),
        'menu_icon'             => 'dashicons-admin-page'
    );
    register_post_type( 'agenden', $args );

}
add_action( 'init', 'ABECrm_post_type', 0 );

then a template Agenden.php:

<?php 
/* 
Template Name: ABECrm Agenda 
Template Post Type: Agenden, page
*/ 
?>

Then i create a new page:

$my_post = array(
                              'post_title'    => $mytitle,                            
                              'post_status'   => 'publish',
                              'post_type'     => 'Agenden',
                              'post_name'     => $myurl,                              
                              'page_template' => 'Agenden.php',                           
                            );

                            // Insert the post into the database
                            $ID = wp_insert_post( $my_post );

The result is a page under “Agenden”. If i do quickedit it shows that the template is choosen – but if i call the page template is not used. What did i wrong?

If i use the template on normal page – all is right.