Real subdomain redirects to homepage

Hey all,

Hope you can help me out here. I searched the forums, but no luck ??
I have a main wp setup at https://www.marketingandnetworkinguniversity.com/

This is a multisite install with subdirectories.
I have a ”real” subdomain in use at https://my.marketingandnetworkinguniversity.com

However, when I visit this subdomain it redirects me to the main wordpress install.

Any idea how I can resolve this?
Regards,
Aron