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Multisite with subdirectories, and a WordPress set up in a customized folder

My WP core code is situated in a subfolder, subsequent to the index.php and wp-config.php recordsdata. I attempted to allow the multisite functionalities with subdirectories mode.
However I can’t entry to the wp-admin’s.

To be clear:

It appears WP would not enable us to combine customized core folder and multisite subdirectories.
Or possibly I missed a configuration or a relentless:

outline('WP_ALLOW_MULTISITE', true);

outline('MULTISITE', true);
outline('SUBDOMAIN_INSTALL', false);
outline('DOMAIN_CURRENT_SITE', 'www.instance.com');
outline('PATH_CURRENT_SITE', '/');
outline('SITE_ID_CURRENT_SITE', 1);
outline('BLOG_ID_CURRENT_SITE', 1);

Whereas I can see these two choices for the principle web site:

Did you skilled this sort of set up and did you discover a option to entry to subdirectories website wp-admin’s ?

Thanks lots