Unable to find type [Microsoft.Office.InterOp.OneNote.HierarchyScope

[RavHilton]

G'day,

I am running latest Windows 11 and Microsoft® OneNote® for Microsoft 365 MSO (Version 2405 Build 16.0.17628.20006) 64-bit and when I run this script, all I see is the following error:

InvalidOperation: C:\Users\User.Name\Downloads\ConvertOneNote2MarkDown\ConvertOneNote2MarkDown.ps1:50
Line |
50 | … erarchy("", [Microsoft.Office.InterOp.OneNote.HierarchyScope]::hsPage …
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| Unable to find type [Microsoft.Office.InterOp.OneNote.HierarchyScope].
0

[RavHilton]

By the way, all of the steps below had already been confirmed to be correct...

• Make sure that OneNote is installed, or the Com automation server won't be able to load it.
• OneNote MUST be Open and running.
• Make sure that OneNote and powershell are running in the same security context (e.g. run PowerShell as regular user, not as an administrator if OneNote is not running as an administrator)
• Make sure that you are using the correct PowerShell architecture as OneNote (e.g. x64 if OneNote x64 is running).
  For me, using just "PowerShell" and not "PowerShell x64" or "PowerShell x86" and not opening as an administrator did the trick.

x64 OneNote, x64 PowerShell, both running as non-admin, OneNote open and synced...

[vcantrell]

I resolved this via another answer by using PowerShell 6 or lower. I had previously been attempting it via Terminal on Windows 11, and also with PowerShell 7 and was getting the same HeirachyScope error but running it with PowerShell 6 worked fine. In case this helps anyone.