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  • If the data isn’t sent from the form, you can dump out the post value before your code and see what’s the actual key is. (maybe there’s a typo in your field key)

    echo '<pre>';
    echo '</pre>';

    Another reason might be, the form is sending the value as a string, but the wp functions requires a pure integer. See last example in the doc,

    So, your code might even need to cast the value with intval first.

    'custom_tax_tag => array( intval($_POST['acf']['field_5a903d3132d04']) )