Make fields optional in WooCommerce My account edit addresses

To make all My account > addresses fields optional use the following:

// Make all My account addresses fields optional
add_filter( 'woocommerce_default_address_fields' , 'filter_my_account_addresses_fields', 999 );
add_filter( 'woocommerce_billing_fields', 'filter_my_account_addresses_fields', 999 );
function filter_my_account_addresses_fields( $fields ) {
    // Only on My account edit addresses
    if ( is_wc_endpoint_url( 'edit-address' ) ) {
        // Loop through existing fields
        foreach( $fields as $field_key => $field_data ) {
            // if they are required
            if( $fields[$field_key]['required'] ) {
                // Make them optional
                $fields[$field_key]['required'] = false;
            }
        }
    }

    return $fields;
}

// Optionaly remove ("optional)" text from My account addresses fields
add_filter( 'woocommerce_form_field' , 'remove_account_addresses_optional_fields_label', 10, 4 );
function remove_account_addresses_optional_fields_label( $field, $key, $args, $value ) {
    // Only on My account edit addresses
    if ( is_wc_endpoint_url( 'edit-address' ) ) {
        $optional = '&nbsp;<span class="optional">(' . esc_html__( 'optional', 'woocommerce' ) . ')</span>';
        $field = str_replace( $optional, '', $field );
    }
    return $field;
}

Code goes in functions.php file of the active child theme (or active theme). Tested and works.