CPT Archive page > 404 since turning on MU

We have a custom post type called Locations.

Since turning on subdirectory MU, the locations’ URLs have changed from:

https://mandoemedia.com/locations/jacksonville/

to

https://mandoemedia.com/blog/locations/jacksonville/

This is okay in theory.

However, the Locations archive page is now producing a 404 page.

ie. Both https://mandoemedia.com/locations/ & https://mandoemedia.com/blog/locations/ produce a 404.

Our Yoast SEO sitemap for Locations contains the URL https://mandoemedia.com/blog/locations/ as if that is the correct URL, but that is producing the 404.

In our CPT definition, we have:

function create_locations() {

	$labels = array(
		'name' => _x( 'Locations', 'Post Type General Name', 'textdomain' ),
		'singular_name' => _x( 'Locations', 'Post Type Singular Name', 'textdomain' ),
		'menu_name' => _x( 'Locations', 'Admin Menu text', 'textdomain' ),
		'name_admin_bar' => _x( 'Locations', 'Add New on Toolbar', 'textdomain' ),
		'archives' => __( 'Locations Archives', 'textdomain' ),
		'attributes' => __( 'Locations Attributes', 'textdomain' ),
		'parent_item_colon' => __( 'Parent Locations:', 'textdomain' ),
		'all_items' => __( 'All Locations', 'textdomain' ),
		'add_new_item' => __( 'Add New Locations', 'textdomain' ),
		'add_new' => __( 'Add New', 'textdomain' ),
		'new_item' => __( 'New Locations', 'textdomain' ),
		'edit_item' => __( 'Edit Locations', 'textdomain' ),
		'update_item' => __( 'Update Locations', 'textdomain' ),
		'view_item' => __( 'View Locations', 'textdomain' ),
		'view_items' => __( 'View Locations', 'textdomain' ),
		'search_items' => __( 'Search Locations', 'textdomain' ),
		'not_found' => __( 'Not found', 'textdomain' ),
		'not_found_in_trash' => __( 'Not found in Trash', 'textdomain' ),
		'featured_image' => __( 'Featured Image', 'textdomain' ),
		'set_featured_image' => __( 'Set featured image', 'textdomain' ),
		'remove_featured_image' => __( 'Remove featured image', 'textdomain' ),
		'use_featured_image' => __( 'Use as featured image', 'textdomain' ),
		'insert_into_item' => __( 'Insert into Locations', 'textdomain' ),
		'uploaded_to_this_item' => __( 'Uploaded to this Locations', 'textdomain' ),
		'items_list' => __( 'Locations list', 'textdomain' ),
		'items_list_navigation' => __( 'Locations list navigation', 'textdomain' ),
		'filter_items_list' => __( 'Filter Locations list', 'textdomain' ),
	);
	$args = array(
		'label' => __( 'Locations', 'textdomain' ),
		'description' => __( '', 'textdomain' ),
		'labels' => $labels,
		'menu_icon' => 'dashicons-location-alt',
		'supports' => array('title', 'excerpt', 'thumbnail', 'page-attributes', 'post-formats'),
		'taxonomies' => array(),
		'public' => true,
		'show_ui' => true,
		'show_in_menu' => true,
		'menu_position' => 5,
		'show_in_admin_bar' => true,
		'show_in_nav_menus' => true,
		'can_export' => true,
		'has_archive' => true,
		'hierarchical' => false,
		'exclude_from_search' => false,
		'show_in_rest' => true,
		'publicly_queryable' => true,
		'capability_type' => 'post',
	);
	register_post_type( 'locations', $args );

Note: 'has_archive' => true,.

Other pages & posts are displaying fine.

Help appreciated.

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