Can't use get_the_terms() within a function that hooks into publish_post

[defunctlife]

I've tried everything, but get_the_terms() always returns false. When using a similar function on the actual single.php page it works fine. I have confirmed the correct post id's are being returned within the dashboard. I have also confirmed that indeed these posts have a taxonomy item of myshift_title from within the dashboard. I tried wp_get_object_terms() but it returns an empty array.

From what I can tell I just can access a post's taxonomy, and I would really like to.

From my functions.php

function shift_add_progress_report_notification($post_ID) {		

	/* Register the taxonomy as we don't seem to have access to it here */	
	register_taxonomy('myshift_title', array('myshift', 'post'), array('label' => 'My Shift Title', 'rewrite' => false, 'query_var' => true));

	$terms = get_the_terms( $post_ID, 'myshift_title');

	ob_start();
	var_dump($terms);
	$a = ob_get_contents();
	ob_end_clean();
	
	mail('xxxxxxx', 'Progress Report', $a . ' POST ID: ' . $post_ID);
}
add_action( 'publish_post', 'shift_add_progress_report_notification', 10, 1);

[defunctlife]

removed comment.

[defunctlife]

This appears to be an issue as I am posting this post with ajax...still investigating. Found a work around in my case not using any hooks and just calling the function manually where we create the post.

[wonderboymusic]

I think you have some code in weird places - this works:

add_action( 'init', function () {
	register_taxonomy( 'custom_thing', 'post', array( 'labels' => array( 'name' => 'Woo Hoo' ) ) );
} );

$terms = get_the_terms( 10, 'custom_thing' );
var_dump( $terms );

function shift_add_progress_report_notification( $post_ID ) {		

	$terms = get_the_terms( $post_ID, 'custom_thing' );

	var_dump( $terms );
	exit();
}
add_action( 'publish_post', 'shift_add_progress_report_notification', 10, 1 );