"Object Not Found" issues with Multisite + Sub Directory Install

I have an Nginx Setup and have placed the new Mapped Domain to the Nginx Config.

However I am not too sure how I can set this up since it is the first time I am setting up a Domain to a Multisite Subdomain.

Here is how my server works.

I have originally added www.domain.com to the Nginx Server config and works fine.

Then I have a new website which was www.domain.com/newsite. Which I mapped with www.newsite.com, have also added this new domain in the Nginx Config.

However, the www.newsite.com is giving me the “Object Not Found” error. So I added the www.newsite.com domain to my dns but not too sure how to set it up since it still does not work.

Please let me know what I need to do.

Thanks