Hi @Jehad Jawad
Could you tell me what properties did you change in AD Users?
Before you use the command "Update-CsAddressBook", please try to follow these steps to see if it can be fixed:
1)Log off of the Skype for Business client and delete SIP profile from:
%userprofile%\appdata\Local\Microsoft\Office\16.0\Lync
2)Execute the following command in the command prompt to add the registry that forces the Skype for Business client to immediately download the address book:
reg add HKLM\Software\Policies\Microsoft\Office\16.0\Lync /v GalDownloadInitialDelay /t REG_DWORD /d 0 /f
3)Run Skype for Business client.
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