Phone number instead of contact name is displayed for an Active Directory contact in Skype for Business 2015 (Lync 2013)

An Active Directory contact name is not displayed but the phone number is displayed in Microsoft Skype for Business 2015 (Lync 2013). This issue occurs when the following conditions are true:

• An Active Directory contact contains a telephone number, an email address, and a full name.

• You have set the EnableExchangeContactSync parameter to False or cleared the Sync contact info between Skype for Business and Exchange option in the Personal section of Options.

This is caused by a missed scenario to fetch the contact's display name.

To fix this issue, install the November 7, 2017, update (KB4011255) for Skype for Business 2015 (Lync 2013), and then use one of the following settings to enable the update.
Note Lync 2013 was upgraded to Skype for Business in April 2015.

In-band provisioning setting

Run the following command from a Lync PowerShell command prompt:

$a = New-CsClientPolicyEntry -Name EnableContactResolutionWithTelUriAndEmailOnly -Value "true"
Set-CsClientPolicy -Identity Global -PolicyEntry @{Add=$a}

GPO setting

1. In Group Policy Management, create a Group Policy object.
   Note When you create a GPO, specify a name and leave the source as none.
2. On the Settings tab, right-click Computer Configuration or User Configuration, and then select Edit.
3. Right-click Registry, select New, and then select Registry Item.
4. In the New Registry Properties dialog box, specify the following information, and then select OK:
   
   Action: Create
   Hive: HKEY_CURRENT_USER
   Key path: Software\Policies\Microsoft\Office\15.0\Lync
   Value name: EnableContactResolutionWithTelUriAndEmailOnly
   Value type: REG_DWORD
   Value data: 1
   Base: Decimal