Getting an Image from a Setting Page Value

Hello, Ahn!

I'm working on a settings page and would like to get a value from the settings page that I can display using a shortcode. I have the shortcode working properly when I manually input the image URL, but I can't get it to pull the image from the MB Settings Page. I think I just am not quite comfortable enough with PHP to know what I could be doing wrong. Here's what I have:

SHORTCODE:

// Shortcode for organization icon and name in dashboard sidebar [dgtl_admin_menu_profile]
function dgtl_admin_menu_profile_function( $atts = array() ) {
  
    // set up default parameters
    extract(shortcode_atts(array(
     'icon' => 'https://digitalchurchplatform.com/wp-content/uploads/2019/02/PlatformSquareIcon.svg'
    ), $atts));
    
    $org = get_bloginfo( 'name' );
    $icon = rwmb_meta( $logo, array( 'object_type' => 'setting' ), $dgtl_settings );
    
    return "<img src=\"$icon\" alt=\"organization-icon\" width=\"64\" height=\"64\" class=\"dgtl-admin-menu-profile\" />$org";
}

add_shortcode('dgtl_admin_menu_profile', 'dgtl_admin_menu_profile_function');

And here's the SETTINGS PAGE code:

// Register meta boxes and fields for settings page
add_filter( 'rwmb_meta_boxes', 'prefix_options_meta_boxes' );
function prefix_options_meta_boxes( $meta_boxes ) {
    $meta_boxes[] = array(
        'id'             => 'general',
        'title'          => 'General',
        'settings_pages' => 'dgtl_settings',
        'tab'            => 'general',

        'fields' => array(
            array(
                'name' => 'Logo',
                'id'   => 'logo',
                'type' => 'file_input',
                'std'  => 'https://digitalchurchplatform.com/wp-content/uploads/2019/02/PlatformSquareIcon.svg'
            ),
            array(
                'name'    => 'Layout',
                'id'      => 'layout',
                'type'    => 'image_select',
                'options' => array(
                    'sidebar-left'  => 'https://i.imgur.com/Y2sxQ2R.png',
                    'sidebar-right' => 'https://i.imgur.com/h7ONxhz.png',
                    'no-sidebar'    => 'https://i.imgur.com/m7oQKvk.png',
                ),
            ),
        ),
    );
    $meta_boxes[] = array(
        'id'             => 'colors',
        'title'          => 'Colors',
        'settings_pages' => 'dgtl_settings',
        'tab'            => 'design',

        'fields' => array(
            array(
                'name' => 'Heading Color',
                'id'   => 'heading-color',
                'type' => 'color',
            ),
            array(
                'name' => 'Text Color',
                'id'   => 'text-color',
                'type' => 'color',
            ),
        ),
    );

    $meta_boxes[] = array(
        'id'             => 'info',
        'title'          => 'Theme Info',
        'settings_pages' => 'dgtl_settings',
        'tab'            => 'faq',
        'fields'         => array(
            array(
                'type' => 'custom_html',
                'std'  => 'Having questions? Check out our documentation',
            ),
        ),
    );
    return $meta_boxes;
}

(Most of that settings page code is just what I've pasted from your example.)

Thank you for your help!