added Failure event for 4774

windows/keep-secure/TOC.md

@@ -197,7 +197,7 @@
 ###### [Monitor claim types](monitor-claim-types.md)
 ##### [Advanced security audit policy settings](advanced-security-audit-policy-settings.md)
 ###### [Audit Credential Validation](audit-credential-validation.md)
-####### [Event 4774 S: An account was mapped for logon.](event-4774.md)
+####### [Event 4774 S, F: An account was mapped for logon.](event-4774.md)
 ####### [Event 4775 F: An account could not be mapped for logon.](event-4775.md)
 ####### [Event 4776 S, F: The computer attempted to validate the credentials for an account.](event-4776.md)
 ####### [Event 4777 F: The domain controller failed to validate the credentials for an account.](event-4777.md)

windows/keep-secure/event-4774.md

@@ -1,6 +1,6 @@
 ---
 title: 4774(S) An account was mapped for logon. (Windows 10)
-description: Describes security event 4774(S) An account was mapped for logon.
+description: Describes security event 4774(S, F) An account was mapped for logon.
 ms.pagetype: security
 ms.prod: w10
 ms.mktglfcycl: deploy
@@ -8,14 +8,13 @@ ms.sitesec: library
 author: Mir0sh
 ---
 
-# 4774(S): An account was mapped for logon.
+# 4774(S, F): An account was mapped for logon.
 
 **Applies to**
 -   Windows 10
 -   Windows Server 2016
 
-
-It appears that this event never occurs.
+Success events do not appear to occur. Failure event [has been reported](http://forum.ultimatewindowssecurity.com/Topic7313-282-1.aspx). 
 
 ***Subcategory:*** [Audit Credential Validation](audit-credential-validation.md)
 
@@ -23,7 +22,7 @@ It appears that this event never occurs.
 
 *An account was mapped for logon.*
 
-*Authentication Package:%1*
+*Authentication Package:Schannel*
 
 *Account UPN:%2*