diff --git a/windows/security/threat-protection/windows-defender-atp/event-error-codes-windows-defender-advanced-threat-protection.md b/windows/security/threat-protection/windows-defender-atp/event-error-codes-windows-defender-advanced-threat-protection.md
index f4c7dd2bb3..1d174e789f 100644
--- a/windows/security/threat-protection/windows-defender-atp/event-error-codes-windows-defender-advanced-threat-protection.md
+++ b/windows/security/threat-protection/windows-defender-atp/event-error-codes-windows-defender-advanced-threat-protection.md
@@ -10,7 +10,7 @@ ms.pagetype: security
 ms.author: macapara
 author: mjcaparas
 ms.localizationpriority: high
-ms.date: 04/24/2018
+ms.date: 05/21/2018
 ---
 
 
@@ -211,6 +211,12 @@ Check that the onboarding settings and scripts were deployed properly. Try to re
 See [Onboard Windows 10 machines](configure-endpoints-windows-defender-advanced-threat-protection.md).</td>
 </tr>
 <tr>
+<td>29</td>
+<td>Failed to read the offboarding parameters. Error type: %1, Error code: %2, Description: %3 </td>
+<td>This event occurs when the system can't read the offboarding parameters.</td>
+<td>Ensure the machine has Internet access, then run the entire offboarding process again.</td>
+</tr>
+<tr>
 <td>30</td>
 <td>Windows Defender Advanced Threat Protection service failed to disable SENSE aware mode in Windows Defender Antivirus. Failure code: ```variable```.</td>
 <td>Normally, Windows Defender Antivirus will enter a special passive state if another real-time antimalware product is running properly on the machine, and the machine is reporting to Windows Defender ATP.</td>