Exchange 2016 removing old server remnants

Last year, we migrated from Exchange 2010 to Exchange 2016.  I thought we properly removed all traces of the old server, but ran into an issue when running Get-OutlookAnywhere:

[PS] C:\Windows\system32>Get-OutlookAnywhere
Creating a new session for implicit remoting of "Get-OutlookAnywhere" command...

The task wasn't able to connect to IIS on the server 'OBB-MAIN.local.domain'. Make sure that the server exists and can
be reached from this computer: The RPC server is unavailable.
    + CategoryInfo          : ReadError: (OBB-MAIN\Rpc (Default Web Site):ADObjectId) [Get-OutlookAnywhere], IISNotReachabl
   eException
    + FullyQualifiedErrorId : [Server=OFFICE-SERVER,RequestId=de088599-96c6-4523-bca6-91872da78153,TimeStamp=4/28/2021 1:26
   :20 AM] [FailureCategory=Cmdlet-IISNotReachableException] C11D7EAB,Microsoft.Exchange.Management.SystemConfigurationTas
  ks.GetRpcHttp
    + PSComputerName        : office-server.local.domain

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The old server is OBB-Main, and the new server is Office-Server.  I tried locating references to OBB-Main in IIS, but was unsuccessful.  Any idea where this setting is hiding out?

-Robert