Multisite issue can not access Network

I have installed a WordPress Multisite and already solved some issues related to domain name change but I still have and issue when I try to access /wp-admin/network it redirects to a new page https://mydomain.com/wp-signup.php?new=mydomain.com with the message:

Other pages that do not work:
/wp-admin/network/plugins.php
/wp-admin/network/settings.php

Greetings Network Administrator! The network currently disallows registrations. To change or disable registration go to your Options page.
Registration has been disabled.

It seems it does not recognize the main site!

Can be related to some setting in the database or wp-config.php or htaccess?

• This topic was modified 1 year, 3 months ago by Steven Stern (sterndata).
• This topic was modified 1 year, 3 months ago by capbussat.