The J

Problem:
You are trying to import content using WP All Import in the main language and want to duplicate it to other WPML languages simultaneously. However, the WPML All Import add-on does not support this feature, and it is unlikely to be updated as it is a legacy plugin.
Solution:
We recommend using a custom PHP function during the import process to duplicate imported posts to all active WPML languages. Here is an example function as reference:

function wpml_duplicate_post_to_all_languages($post_id) {
    $default_lang = apply_filters( 'wpml_default_language', null );
    $current_lang = apply_filters( 'wpml_current_language', null );
 
    // Only duplicate if we're importing in the default language
    if ( $current_lang !== $default_lang ) {
        return;
    }
 
    $languages = apply_filters( 'wpml_get_active_languages', null, array( 'skip_missing' => 0 ) );
 
    foreach ( $languages as $lang_code => $lang_info ) {
        if ( $lang_code === $default_lang ) {
            continue;
        }
 
        $existing_translation_id = apply_filters( 'wpml_object_id', $post_id, get_post_type( $post_id ), false, $lang_code );
 
        if ( ! $existing_translation_id ) {
            do_action( 'wpml_make_post_duplicates', $post_id );
        }
    }
}

Ensure that all important fields for your import are set to "Copy" in WPML → Settings → Custom Field Translation. We recommend testing this function on a staging site first.

If this solution does not apply to your case, or if it seems outdated, please check the related known issues, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins. If issues persist, we highly recommend opening a new support ticket at WPML support forum.