WordPress – wp-admin subdomain

I’m new with WordPress, trying to map the wp-admin to a subdomain:

instead of:
www.mydomain.net/wp-admin
I would like:
admin.mydomain.net

I have already created a sub-domain (I use GoDaddy) that maps admin.mydomain.net to www.mydomain.net/wp-admin

I’m posting this question after searching the whole wide web, but all I found is moving the entire site to a subdomain, which I am not interested in.

Thanks in advance to all the helpers!

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