Multisite wp-signup.php as index page

Using Multisite for the first time. I followed the instruction from this site and everything is working great. The only problem I am having now is when I go to the network admin sites url it instantly redirects me to https://www.mysite.com/wp-signup.php?new=mysite.com. If I add wwww. before it it works, without the www it does the wp-setup.php thing.

How can I change this so if someone enters mysite.com without the www it works properly?