Modern Auth and Unattended Scripts in Exchange Online PowerShell V2

JrouziesM Thank you very much for this... and it appears to work (in that I no longer get an error when I connect).

However, once I have connected, and when I then try to use the cmdlet Get-EXOMailbox an exception gets thrown with the following unhelpful error

System event notifications are not supported under the current context. Server processes, for example, may not support global system event notifications.

which doesn't make any sense to me, and neither can I find anything useful about it on the Internet.

[InvalidOperationException: System event notifications are not supported under the current context. Server processes, for example, may not support global system event notifications.]
   Microsoft.Win32.SystemEvents.EnsureSystemEvents(Boolean requireHandle, Boolean throwOnRefusal) +566
   Microsoft.Exchange.Management.RestApiClient.AdminCmdlet`2.BeginProcessing() +546
   System.Management.Automation.Cmdlet.DoBeginProcessing() +85
   System.Management.Automation.CommandProcessorBase.DoBegin() +378

[CmdletInvocationException: System event notifications are not supported under the current context. Server processes, for example, may not support global system event notifications.]
   System.Management.Automation.Runspaces.PipelineBase.Invoke(IEnumerable input) +365
   System.Management.Automation.Runspaces.Pipeline.Invoke() +12
   ACS.Web.Email.MailboxForward.Business.MailboxForwardBLL.GetUsersUsingCertificate() in C:\Projects\ACS.Web.Email.MailboxForward\ACS.Web.Email.MailboxForward.Business\MailboxForwardBLL.cs:154
   ACS.Web.Email.MailboxForward.Default.Page_Load(Object sender, EventArgs e) in C:\Projects\ACS.Web.Email.MailboxForward\ACS.Web.Email.MailboxForward\Default.aspx.cs:65

Have you come across this before?

Regards, Ade