The ACF taxonomy field stores an array of term ID values, you can’t search based on the term name or use ‘=’ for the comparison.
You need to use the term id and you need to use LIKE, something like this
'search' => '*'.esc_attr( $search ).'*', 'meta_query' => array( array( 'key' => organization_category, 'value' => '"'.$term->term_id.'"', 'compare' => 'LIKE' ) ).......
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