Problem with Wordpress multisite (Network)

Hello guys! Does anyone have the multisite option activated in wordpress? I have tried to activate it by following the following instructions
https://wordpress.org/support/article/create-a-network/

I have managed to activate the option in my WordPress installation and I can access the menu to create new sites. But when I try to access the new sites I get an error page. looking in directory /var/www/wordpress I see that no new folder has been created. Some help?
Thanks!