FusionAuth is installed in a Kubernetes On-Premise cluster, and does not allow you to create more users after the installation process.

Authenticated with the administrator user
Installation is done with HELM. The used values.yaml file is attached.
affinity: {}
annotations: {}
app:
  memory: 256M
  runtimeMode: development
autoscaling:
  enabled: false
database:
  existingSecret: ''
  host: XXX.XXX.XXX.XXX
  name: fusionauth
  password: SuperSecretPassword
  port: 5432
  protocol: postgresql
  root:
    password: ''
    user: ''
  tls: false
  tlsMode: require
  user: adminfusionauth
dnsConfig: {}
dnsPolicy: ClusterFirst
environment: []
extraContainers: []
extraInitContainers: []
extraVolumeMounts: []
extraVolumes: []
fullnameOverride: ''
image:
  pullPolicy: IfNotPresent
  repository: fusionauth/fusionauth-app
  tag: 1.40.2
imagePullSecrets: []
ingress:
  annotations: {}
  enabled: false
  extraPaths: []
  hosts: []
  ingressClassName: null
  paths: []
  tls: []
initContainers:
  image:
    repository: busybox
    tag: latest
  resources: {}
  waitForDb: true
  waitForEs: true
kickstart:
  data: {}
  enabled: false
lifecycle: {}
livenessProbe:
  failureThreshold: 3
  httpGet:
    path: /
    port: http
  periodSeconds: 30
  timeoutSeconds: 5
nameOverride: ''
nodeSelector: {}
podAnnotations: {}
podDisruptionBudget:
  enabled: false
readinessProbe:
  failureThreshold: 5
  httpGet:
    path: /
    port: http
  timeoutSeconds: 5
replicaCount: 1
resources: {}
search:
  engine: null
  host: null
  port: null
  protocol: null
service:
  annotations: {}
  port: 9011
  spec: {}
  type: ClusterIP
serviceAccount:
  create: false
  name: ''
serviceMonitor:
  annotations: {}
  basicAuth: {}
  enabled: false
  interval: null
  labels: {}
  namespaceSelector: {}
  path: api/prometheus/metrics
  relabelings: []
  scrapeTimeout: null
startupProbe:
  failureThreshold: 20
  httpGet:
    path: /
    port: http
  periodSeconds: 10
  timeoutSeconds: 5
tolerations: []
topologySpreadConstraints: []
global:
  cattle:
    systemProjectId: p-rdd8t