Need help with making subdomain redirect to another domain on nginx (but don't have subpages redirect; just the root)

Need help with making subdomain 301-redirect to another domain on nginx (but don't have subpages redirect; just the root)

so site [url removed, login to view] should 301-redirect to an external domain name, but all [url removed, login to view]* subpages should continue acting as they are.

Linux Nginx

Projektin tunnus: #7908615

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