404 error on multisite

Hi everybody
I installed a multisite wordpress on this main blog
https://www.jpdutilleux.com
I followed srupulously all the installation procedure (I had already did it once before and everything was fine by then)

But this time, big pb,

1_ the homepage doesn’t display correctly (https://en.jpdutilleux.com/)

2_ I created a featured list with pictures but I systematically get a 404 error page, like in here : https://en.jpdutilleux.com/featured/exposition-a-lhotel-de-limur-vannes/

So here my .htacess file in case somebody could help me

# BEGIN WordPress
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

# END WordPress

And here’s an extract of my wp-config (I changed : ‘SUBDOMAIN_INSTALL’ from false to true but the pb was the same before I did it)

/* Multisite */
define('WP_ALLOW_MULTISITE', true);
define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', true);
define('DOMAIN_CURRENT_SITE', 'www.jpdutilleux.com');
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

Thanks guys and girls