Data from ajax not updating post meta

Well, my code seems to be ok.
I just needed to remove the “disabled” state of the field that prevented the update metadata for a completely unknown reason to me.

Merci Sim 😉

Replaced this

 <input type="text" id="union_id_field" name="union_id_field" value="<?php echo esc_attr( $value ); ?>" disabled>

By this

 <input type="text" id="union_id_field" name="union_id_field" value="<?php echo esc_attr( $value ); ?>">

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