wp-activate.php gives wrong title in browser tab

Hi, have a multisite setup using subdirectories.

When a new user is added to the first site on the network (blog id 1), all works as expected.

On further blogs, when a new user is added and sent an activation email the page itself displays with their username and password information and the blog url eg https://www.somedomain.com/blogid2/wp-activate.php?key=c1234567z890 however the page title in the browser tab says Page Not Found | Blog ID 2

I have no plugins installed (removed akismet and hello dolly).
Using the default theme that installs with WP.

1) How do I go about fixing the page title issue?

2) Is there a way to have them given the main network login url in the activation email as by default (if i understand correctly) if they login there that should redirect them to the dashboard for their primary blog/site anyhow.

Thanks ??