MULTI NETWORKS With Each Network As a Subdirectory

Hello All,

The end goal is to run multiple networks of multisites structured as subdirectories of the main network site. Like this: https://wordpress.stackexchange.com/questions/260105/multiple-multisite-networks-on-the-same-domain

I created a new WP multisite subdirectory installation and activated the multi-network plugin: https://wordpress.org/plugins/wp-multi-network/

NOTE: The WP subdirectory installation also has the WPMUDEV Domain Mapping and Multi- Domains plugins and the associated Sunrise.php file installed. I tried creating the desired multi-network structure with the plugins active and inactive with the same results.

I also modified wp-config but encountered inconsistent instructions about how wp-config should be configured:

Scenario 1:
Readme.txt in plugin Wp Multi Network

Scenario 2:
https://premium.wpmudev.org/blog/wordpress-multi-network/

Scenario 3:
https://jessesmithmba.com/blog/introduction-to-multi-networks-for-wordpress-multisite/

Scenario 4: (seems most applicable to our goals but lacks wp-config instructions)
https://wordpress.stackexchange.com/questions/260105/multiple-multisite-networks-on-the-same-domain

WHAT CURRENTLY WORKS
Network 1 (this works)
network – domain.us
then
sub site – domain.us/hq
sub site – domain.us/regions
sub site – domain.us/locations
etc.
*network activated plugins on this network are activated only on each sub site of this network and not on other networks. This is what we want)

Network 2 (this works)
network – domain.ws
then
sub site – domain.ws/hq
sub site – domain.ws/regions
sub site – domain.ws/locations
etc.
*network activated plugins on this network are activated only on each sub site of this network and not on other networks. This is what we want)

WHAT CURRENTLY DOES NOT WORK
Network 3 – I am unable to make new networks in subdirectories. I am under the impression that I should be able to create new networks as subdirectories.

For Example:
Network A – domain.us/regions
then
sub site – domain.us/regions/1
sub site – domain.us/regions/2
sub site – domain.us/regions/3
etc.

Network B – domain.us/locations
then
sub site – domain.us/location/1
sub site – domain.us/location/2
sub site – domain.us/location/3
etc.

What am I missing?

Any assistance will be appreciated.

***** DIFFERENT SCENARIO THAN OUR CASE BUT INTERESTING*****
https://florianbrinkmann.com/en/wordpress-multisite-mix-of-subdomains-and-subdirectories-3446/
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