How to Fix SPMT Module ActiveX Single-threaded apartment Error

Question

I have created a Powershell tool to set up SharePoint sites and it uses the SharePoint Migration Tool. However, when trying to register an SPMT Migration, it fails with the following error:

Register-SPMTMigration : ActiveX control '8856f961-340a-11d0-a96b-00c04fd705a2' cannot be instantiated because the 
current thread is not in a single-threaded apartment. 
At line:2 char:1 
+ Register-SPMTMigration -migratewithoutrootfolder -force -erroraction: ... 
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
    + CategoryInfo          : InvalidOperation: (:) [Register-SPMTMigration], AADAuthenticationException 
    + FullyQualifiedErrorId : MigrationLibError,Microsoft.SharePoint.MigrationTool.PowerShell.RegisterSPMTMigration

This occurs in PS7 and PS5, admin or normal user, and happens with just the following two commands:

Import-Module Microsoft.SharePoint.MigrationTool.PowerShell
Register-SPMTMigration -migratewithoutrootfolder -force -erroraction:stop

I've tried on multiple accounts and multiple versions of PowerShell. I've made sure everything is up to date. I've run the commands as the only script happening on my computer and the first commands run in a newly open PowerShell window. And, of course, I've restarted the computer.

I've also tried adding the following command prior to importing the module or registering the SPMT migration:

[Threading.Thread]::CurrentThread.SetApartmentState([Threading.ApartmentState]::STA)

Any help would be greatly appreciated.

Answer 1

Mare sure there is no windows update pending and connect to SharePoint Online first, then Register-SPMTMigration.

$Global:UserName = "admin@contoso.onmicrosoft.com"
$Global:PassWord = ConvertTo-SecureString -String "YourSPOPassword" -AsPlainText -Force
$Global:SPOCredential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $Global:UserName, $Global:PassWord

Connect-SPOService -Url https://contoso-admin.sharepoint.com -Credential $Global:SPOCredential

Import-Module Microsoft.SharePoint.MigrationTool.PowerShell
Register-SPMTMigration -SPOCredential $Global:SPOCredential -Force

If the issue exists, try to run PowerShell in another computer, compare the result.

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