Unable to create user via API

Grafana Configuration
10

My API key does not seem to have the permissions to create a user. So, I edited etc/grafana/provisioning/access-control/sample.yaml

# ---
# # config file version
 apiVersion: 2

 # <list> list of roles to insert/update/delete
 roles:
   # <string, required> name of the role you want to create or update. Required.
   - name: 'custom:users:writer'
     # <string> uid of the role. Has to be unique for all orgs.
     uid: customuserswriter1
     # <string> description of the role, informative purpose only.
     description: 'Create, read, write users'
     # <int> version of the role, Grafana will update the role when increased.
     version: 2
     # <int> org id. Defaults to Grafana's default if not specified.
     orgId: 1
     # <list> list of the permissions granted by this role.
     permissions:
       # <string, required> action allowed.
       - action: 'users:read'
         #<string> scope it applies to.
         scope: 'global.users:*'
       - action: 'users:write'
         scope: 'global.users:*'
       - action: 'users:create'

After this, I sent a request to this endpoint:

curl -X POST https://<admin>:<admin-pwd>@<my-host>/api/admin/provisioning/access-control/reload 
-H "Accept: application/json" 
-H "Content-Type: application/json"

here is the response:

{"message":"Not found"}

Others work for example:

curl -X POST https://<admin>:<admin-pwd>@<my-host>/api/admin/provisioning/notifications/reload 
-H "Accept: application/json" 
-H "Content-Type: application/json"

{"message":"Notifications config reloaded"}

What am I doing incorrectly? Docs are very confusing, to be honest. This section: Admin HTTP API | Grafana documentation really needs an update. It never mentions what to do if things go wrong.