my query does not display extensionAttribute11 value - populated in Active directory

Get-ADUser -SearchBase "OU=SERVICE ACCOUNTS,OU=CBS IT SERVICES,OU=CBS Client Management,DC=internal,DC=bloodservices,DC=ca" | select name, extensionAttribute11
cmdlet Get-ADUser at command pipeline position 1
Supply values for the following parameters:
(Type !? for Help.)
Filter: *

name                           extensionAttribute11                                                                              
SCCMAdmin                                                                                                                                                                                              SCCMSQLAdmin                                                                                                                                                                                           SCCMOSD                                                                                                                                                                                                WIN7                                                                                                                                                                    aqmldap                                                                                                                                                                                                ADMIN_AGPM                                                                                                                                                                                        Bit.Locker                                                                                                                                                                                             MBAM SSRS                                                                                                                                                                                           SCCMWSAdmin   

I am attempting to get the value in extensionAttribute11 - however no values appear - values are populated in AD - when querying with powershell - No value   Why is that? my ultimate goal is to populate extensionAttribute11 with ServiceAccount

Why does my query ask for filter - i put in *