An error caused a change in the current set of domain controllers

[Bowerz]

Hi there,

Thanks a lot for this script, it appears to be exactly what I was looking for and very useful.

I have a small question in that i seem to produce the below error quite a lot when running this. Is this expected and can it be mitigated?

Error on proxy command 'Get-MailboxFolderStatistics -FolderScope:'Calendar' -Identity:'[email protected]'' to server xxxxxxxx.eurprd02.prod.outlook.com: Server version 
15.20.5038.0000, Proxy method PSWS: 
Cmdlet error with following error message:
Microsoft.Exchange.Data.Directory.ADServerSettingsChangedException: An error caused a change in the current set of domain controllers.. 
[Server=xxxxxxxxxxxx,RequestId=xxxxx-xxxxx-xxx-xxxxxx-578b2967c56c,TimeStamp=03/03/2022 09:38:50] .
    + CategoryInfo          : NotSpecified: (:) [Get-MailboxFolderStatistics], CmdletProxyException
    + FullyQualifiedErrorId : [Server=xxxxxxxx,RequestId=xxxxxx-xxxxx-xxxxx-xxxxxxx-578b2967c56c,TimeStamp=03/03/2022 09:38:50] [FailureCategory=Cmdlet-CmdletProxyException] 9E701B98,Microsoft.Exchange.Management.Tasks.GetMailboxFolderStatistics
    + PSComputerName        : outlook.office365.com
 
You cannot call a method on a null-valued expression.
At C:\Users\user\Documents\PowerShell Scripts\Calendar share externally.ps1:76 char:9
+         $calendarfolder = (Get-MailboxFolderStatistics $MB.PrimarySmt ...
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull

[michevnew]

That's more or less a standard issue with running Remote PowerShell against Exchange Online, as servers are regularly taken out of rotation. Not much you can do about it, but try again. I will update the script to use the new, more "robust" REST-based cmdlets when I get some time, as using them should improve the stability.
As a quick fix you can just try replacing them yourself, Get-Mailbox <> Get-EXOMailbox, Get-MailboxStatistics <> Get-EXOMailboxStatistics and so on.

[Bowerz]

It's interesting you post that, I did try to update your script to use these new cmdlets but they don't appear to be recognised when run in a function. Not sure if you had any luck with it?