SOLVED Primary domain may not be subdomain of addon domain issue

[Erasmos]

I hope in this section there's room for absolute beginners' questions. If not, I apologize.

This is my situation:
I need to install a WordPress site on a domain, let's say mydomain.com (example name).
The web agency provided me with the following information (adjusted to the example mydomain.com name):

https://old.mydomain.com:2083
user: usernick
password: userpass

This way, I'm able to access to a cPanel in which General Information section I can read:
Current User: usernick
Primary Domain: old.mydomain.com
Home Directory: /home/usernick

I've tried to add an Addon Domain this way:
New Domain Name: mydomain.com
Subdomain: mydomain
Document Root: public_html/mydomain.com

But I get this answer: Primary domain may not be subdomain of addon domain.

My question is: how can I get a mydomain.com domain?
Or, better, what are the steps to install WordPress so that I can get a site www.mydomain.com?

I apologize for my poor English.
Thank you in advance for your time.


- - -
Additional information:

In cPanel, if I try to click on WordPress Manager, it says: No compatible WordPress installations exist on this cPanel account.
If I choose: Create an installation, it offers me three choices:
http://old.mydomain.com/wordpress
http://web_agency_name.oldmydomain.com/wordpress
http://site.old.mydomain.com/wordpress
For what I can see, none of these look correct. Am I wrong?

cPanel Version: 70.0 (build 44)
Apache Version: 2.4.25
PHP Version: 5.6.30
MySQL Version: 5.6.39
Architecture: x86_64
Operating System: linux

 

[cPanelLauren]

Hello,

This is occurring because your provider created your account as a subdomain of your primary domain. The primary domain of the account should be the root domain - I would ask the provider to modify your account name to the root domain, then create any subdomains or addon domains you'd like.


Thanks!

 

[Erasmos]

@cPanelLauren, thanks a lot for your kind answer.

Do you know how can I mark this thread as solved?

 

[cPanelLauren]

Hi @Erasmos


I can do that for you! I'm happy to have been able to help.

Thanks!