Result of example

PS C:\Users\MYUSERNAME> $OneNote = New-Object -ComObject OneNote.Application
PS C:\Users\MYUSERNAME> $binding = "System.Reflection.BindingFlags" -as [type]
PS C:\Users\MYUSERNAME> $active_window = [System.__ComObject].InvokeMember("CurrentWindow", $binding::GetProperty, $null, $OneNote, $null)
Exception calling "InvokeMember" with "5" argument(s): "Library not registered. (Exception from HRESULT: 0x8002801D (TYPE_E_LIBNOTREGISTERED))"
At line:1 char:1
+ $active_window = [System.__ComObject].InvokeMember("CurrentWindow", $ ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : COMException

PS C:\Users\MYUSERNAME> $active_window_pageId = [System.__ComObject].InvokeMember("CurrentPageId", $binding::GetProperty, $null, $active_window, $null)
Exception calling "InvokeMember" with "5" argument(s): "Method 'System.__ComObject.CurrentPageId' not found."
At line:1 char:1
+ $active_window_pageId = [System.__ComObject].InvokeMember("CurrentPag ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : MissingMethodException

PS C:\Users\MYUSERNAME> Write-Output $active_window_pageId
PS C:\Users\MYUSERNAME>