Get response Ajax save post

Hi everyone,

I added meta box to posts via the add_meta_box function.

And when I save the post, I would like to be able to display an error report via the notice system. I use the save_post action to save my data.

I tried to use the action admin_notice but nothing works. So I was wondering if it was not possible to get a response back from the save_post action in the AJAX request to help me to do this.

Or do you have another way/idea for me?

Thanks a lot.