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I have a custom post type imagery. I have a taxonomy publications. I need all present and future imagery post types have the taxonomy publications. Here's a simplified version of code in functions.php:

$args = array(
    'taxonomy' => array('publications')
register_post_type( 'imagery', $args );

..but it's not working. What am I doing wrong?

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You simply made a mistake on the key to use : it's taxonomies not taxonomy.

$args = array(
    'taxonomies' => array('publications')
register_post_type( 'imagery', $args );
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