Redirect a WordPress Multisite url after it has been change to a new one

In the multisite dashboard network admin, you can edit a site and change its url.

For example, I have this url: and I have change it to

How can I make the redirect to so that users will not get lost and will not return an error? Current error is "Page not found / File not found".

I have tried adding this to my htaccess with no success

RewriteRule ^old/(.*)$   /new/$  1 [R=301,NC,L] 

And also this one

Redirect 301 /old/