[Bug]: Update-AzKeyVaultManagedHsm unable to update certain properties

[DanielMicrosoft]

Description

It appears any property outside of the properties key in the update payload for the Update-AzKeyVaultManagedHsm cannot be updated successfully. Properties that exist within properties (where other validations allow) can be updated successfully.

An example of a property that cannot be updated via this cmdlet is tags.

Example cmdlet:
Update-AzKeyVaultManagedHsm -Name $hsmName -ResourceGroupName $rgName -Tag @{ key = "value" }

Example payload of update causing issue:

{
  "properties": {
    "tenantId": "xxxx-xxxx",
    "initialAdminObjectIds": [
      "xxxx-xxxx"
    ],
    "softDeleteRetentionInDays": 90,
    "networkAcls": {}
  },
  "location": "Central India",
  "sku": {
    "name": "Standard_B1",
    "family": "B"
  }
}

Issue script & Debug output

-- ARM throws 500 upon attempting to update above example

{
  "error": {
    "code": "InternalError",
    "message": "The server encountered an internal error. Please retry the request."
  }
}

Environment data

Name                           Value
----                           -----
PSVersion                      7.5.2
PSEdition                      Core
GitCommitId                    7.5.2
OS                             Microsoft Windows 10.0.26100
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Module versions

ModuleType Version    PreRelease Name                                ExportedCommands
---------- -------    ---------- ----                                ----------------
Script     5.2.0                 Az.Accounts                         {Add-AzEnvironment, Clear-AzConfig, Clear-AzContext, Clear-AzDefault…}
Script     6.3.1                 Az.KeyVault                         {Add-AzKeyVaultCertificate, Add-AzKeyVaultCertificateContact, Add-AzKeyVaultKey, Add-…

Error output