getting values for sub group fields in oxygen

I have added a sub group in metabox and I can't seem to see the field names in oxygen to add the data - can you help please - the code that metabox gave me for my setup is below. I can see the first group in the repeater but not the sub group

<?php
$groups = rwmb_meta( 'treatment_category' );
foreach ( $groups as $group ) {

    // Field text_tu3ffbt7f:
    echo $group[ 'text_tu3ffbt7f' ] ?? '';

    // Field treatment_lede:
    echo $group[ 'treatment_lede' ] ?? '';

    // Field treatment-group:
    $subgroups = $group[ 'treatment-group' ] ?? '';
    foreach ( $subgroups as $subgroup ) {

        // Field treatment-name:
        echo $subgroup[ 'treatment-name' ] ?? '';

        // Field treatment_price:
        echo $subgroup[ 'treatment_price' ] ?? '';

        // Field treatment-space:
        $checkbox = $subgroup[ 'treatment-space' ] ?? 0;
        if ( $checkbox ) {
            echo 'Checked';
        } else {
            echo 'Unchecked';
        }

    }
}