Hi jaddy321,
Start with resaving permalinks at Settings → Permalinks and hit save. That refreshes the rewrite rules, and this kind of issue usually comes back to those not fully applying after the Multisite setup. Then try visiting /wp-admin/network/ URL directly in case the menu link itself is what is failing.
Also, double-check that the .htaccess file matches the Multisite version. That is usually the main reason the network admin page shows as not found. It is important to confirm whether this is set up as subdomains or subdirectories, and that the config matches that. If those do not line up, it can cause routing issues like this. Clear any network or CDN-level caches as well.
Helpful threads if you want to compare:
https://stackoverflow.com/questions/13976266/wordpress-multisite-error-404-on-network-admin-and-other-links
https://wordpress.stackexchange.com/questions/167294/multisite-404-error-for-subdirectory
Most of the time it ends up being rewrite rules or config slightly off.
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This reply was modified 1 week, 1 day ago by
dzawendy.