How to add an admin notice upon post save/update

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The reason this doesn’t work is because there is a redirection happening after the save_post action. One way you can acheive want you want is by implementing a quick work around using query vars.

Here is a sample class to demonstrate:

class My_Awesome_Plugin {
  public function __construct(){
   add_action( 'save_post', array( $this, 'save_post' ) );
   add_action( 'admin_notices', array( $this, 'admin_notices' ) );
  }

  public function save_post( $post_id, $post, $update ) {
   // Do you stuff here
   // ...

   // Add your query var if the coordinates are not retreive correctly.
   add_filter( 'redirect_post_location', array( $this, 'add_notice_query_var' ), 99 );
  }

  public function add_notice_query_var( $location ) {
   remove_filter( 'redirect_post_location', array( $this, 'add_notice_query_var' ), 99 );
   return add_query_arg( array( 'YOUR_QUERY_VAR' => 'ID' ), $location );
  }

  public function admin_notices() {
   if ( ! isset( $_GET['YOUR_QUERY_VAR'] ) ) {
     return;
   }
   ?>
   <div class="updated">
      <p><?php esc_html_e( 'YOUR MESSAGE', 'text-domain' ); ?></p>
   </div>
   <?php
  }
}

Hope this helps you a little bit.
Cheers

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