Throws " 'NoneType' object has no attribute 'CreateUser' " while creating SSO user in vCenter.

Using [vim.Hostsystem] I retrieved content with ContainerView.

Contents of configManager are as follows:

(vim.host.ConfigManager) {
dynamicType = ,
dynamicProperty = (vmodl.DynamicProperty) [],
cpuScheduler = 'vim.host.CpuSchedulerSystem:cpuScheduler-10',
datastoreSystem = 'vim.host.DatastoreSystem:datastoreSystem-10',
memoryManager = 'vim.host.MemoryManagerSystem:memorySystem-10',
storageSystem = 'vim.host.StorageSystem:storageSystem-10',
networkSystem = 'vim.host.NetworkSystem:networkSystem-10',
vmotionSystem = 'vim.host.VMotionSystem:vmotionSystem-10',
virtualNicManager = 'vim.host.VirtualNicManager:virtualNicManager-10',
serviceSystem = 'vim.host.ServiceSystem:serviceSystem-10',
firewallSystem = 'vim.host.FirewallSystem:firewallSystem-10',
advancedOption = 'vim.option.OptionManager:EsxHostAdvSettings-10',
diagnosticSystem = 'vim.host.DiagnosticSystem:diagnosticSystem-10',
autoStartManager = 'vim.host.AutoStartManager:autoStartManager-10',
snmpSystem = 'vim.host.SnmpSystem:snmpSystem-10',
dateTimeSystem = 'vim.host.DateTimeSystem:dateTimeSystem-10',
patchManager = 'vim.host.PatchManager:patchManager-10',
hostUpdateProxyManager = ,
imageConfigManager = ,
bootDeviceSystem = ,
firmwareSystem = 'vim.host.FirmwareSystem:firmwareSystem-10',
healthStatusSystem = 'vim.host.HealthStatusSystem:healthStatusSystem-10',
pciPassthruSystem = 'vim.host.PciPassthruSystem:pciPassthruSystem-10',
licenseManager = ,
kernelModuleSystem = 'vim.host.KernelModuleSystem:kernelModuleSystem-10',
authenticationManager = 'vim.host.AuthenticationManager:authenticationManager-10',
powerSystem = 'vim.host.PowerSystem:powerSystem-10',
cacheConfigurationManager = ,
esxAgentHostManager = ,
iscsiManager = ,
vFlashManager = ,
vsanSystem = ,
messageBusProxy = ,
userDirectory = ,
accountManager = ,
hostAccessManager = ,
graphicsManager = ,
vsanInternalSystem = ,
certificateManager = ,
cryptoManager = ,

accountManager is unset. Why it's unset? Cannot find a way to set it.

Start by reproducing SSO user creation with the vim.HostSystem object and inspect the reported configManager.accountManager value. Determine whether the vCenter API exposes a supported way to obtain or set accountManager, and document the behavior or required correction when the property is unset.