Adding serialnumbers using New-MgDeviceManagementImportedDeviceIdentity - error

Question

I am trying to use the cmd New-MgDeviceManagementImportedDeviceIdentity to insert new serialnumbers from our assetDB.
connect-mggraph works fine, using certificate and appID.

My testing example (serial is fakeserial, but valid):

$NewID = New-Object Microsoft.Graph.PowerShell.Models.MicrosoftGraphImportedDeviceIdentity
$NewID.Description = "A Description"
$NewID.ImportedDeviceIdentifier = "07C200200007"
$NewID.ImportedDeviceIdentityType = "serialNumber"

I then run the command
New-MgDeviceManagementImportedDeviceIdentity -BodyParameter $NewID

The error i receive looks like this.
New-MgDeviceManagementImportedDeviceIdentity : No OData route exists that match template ~/singleton/navigation with http verb POST for request /DeviceEnrollmentFE_2204/StatelessDeviceEnrollmentFESe
rvice/deviceManagement/importedDeviceIdentities.

I posted a ticket about this here: 147
I then tried the suggestion using :

 $ImportedDeviceIdentities = @{
    "@odata.type" = "#microsoft.graph.importedDeviceIdentity"
    Description = "A Description"
    ImportedDeviceIdentifier = "07C200200007"
    ImportedDeviceIdentityType = "serialNumber"
    \# Add more details.
  } 

   Import-MgDeviceManagementImportedDeviceIdentityList -ImportedDeviceIdentities $ImportedDeviceIdentities -OverwriteImportedDeviceIdentities:$false

But this generated a new error:
Import-MgDeviceManagementImportedDeviceIdentityList : Unable to cast object of type 'Microsoft.Graph.PowerShell.Runtime.Json.JsonObject' to type 'Microsoft.Graph.PowerShell.Runtime.Json.JsonArray'.
At line:11 char:1

Import-MgDeviceManagementImportedDeviceIdentityList -ImportedDeviceId ...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
CategoryInfo : NotSpecified: (:) [Import-MgDevice..._ImportExpanded], InvalidCastException
FullyQualifiedErrorId : Microsoft.Graph.PowerShell.Cmdlets.ImportMgDeviceManagementImportedDeviceIdentityList_ImportExpanded

Answer

@Mikael Östergren ， From your description, we are using "New-MgDeviceManagementImportedDeviceIdentity" to import device identities. But it is failed.

Maybe you can try the similar command as below to see if it works:

Install-Module Microsoft.Graph.DeviceManagement.Enrolment   
Import-Module Microsoft.Graph.DeviceManagement.Enrolment  
Connect-MgGraph    
New-MgDeviceManagementImportedWindowAutopilotDeviceIdentity -serialnumber "xxxxxxxx"

Hope it can help.

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Adding serialnumbers using New-MgDeviceManagementImportedDeviceIdentity - error

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