Getting error when I try to remove eum secondary email address from the Mailbox from Exchange 2013 server

Question

Getting error when I try to remove eum secondary email address from the Mailbox from Exchange 2013 server. The command works if you issue directly from the server exchange shell.
I open the remote power shell to the exchange server 2013.
Issue the following commands and getting the following error.
$mailbox = Get-Mailbox -Identity testuser$mailbox.EmailAddresses -= "eum:50004;phone-context=telExt5digits.lync5.com"Then getting the following error:Method invocation failed because [System.Collections.ArrayList] doesn't contain a method named 'op_Subtraction'.
At line:1 char:27
+ $mailbox.EmailAddresses -= <<<<  "eum:50004;phone-context=telExt5digits.lync5.com"
    + CategoryInfo          : InvalidOperation: (op_Subtraction:String) [], RuntimeException
    + FullyQualifiedErrorId : MethodNotFoundHelp!

Answer 1

Now for an answer - your remote session doesn't have the same object you have on the server itself.  Notice it says this is an array list, not a ProxyAddressCollection.  If you need to work around this, you'll need to massage the addresses another
way that the system will accept.  I'd try the following:
$NewAddresses = $mailboxEmailAddresses | ? { $_ -notlike "eum:50004;phone-context=telExt5digits.lync5.com" }
See what you get in the $NewAddresses variable when you do this.