At first, try passing the Taxonomy as a string:
$children = get_term_children($term->term_id, 'locations');
The function get_category_children produces a string as return, so you can just echo it.
the function get_term_children, however, returns an array. To see the contents of the array, try
print_r( $children );
instead of echo.
The last thing to keep in mind is that a taxonomy does not need to be hierarchical – for example the built in tags. Be sure your “locations” is organized hierarchical, otherwise get_term_children won’t work for you in this case.
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