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add info about PA-PK-AS-REQ (16)

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https://github.com/MicrosoftDocs/windows-itpro-docs/issues/5583
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windows/security/threat-protection/auditing/event-4771.md
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@ -184,6 +184,7 @@ The most common values:
| 2 | PA-ENC-TIMESTAMP | This is a normal type for standard password authentication. |
| 11 | PA-ETYPE-INFO | The ETYPE-INFO pre-authentication type is sent by the KDC in a KRB-ERROR indicating a requirement for additional pre-authentication. It is usually used to notify a client of which key to use for the encryption of an encrypted timestamp for the purposes of sending a PA-ENC-TIMESTAMP pre-authentication value.<br>Never saw this Pre-Authentication Type in Microsoft Active Directory environment. |
| 15 | PA-PK-AS-REP\_OLD | Used for Smart Card logon authentication. |
| 16 | PA-PK-AS-REQ | Request sent to KDC in Smart Card authentication scenarios.|
| 17 | PA-PK-AS-REP | This type should also be used for Smart Card authentication, but in certain Active Directory environments, it is never seen. |
| 19 | PA-ETYPE-INFO2 | The ETYPE-INFO2 pre-authentication type is sent by the KDC in a KRB-ERROR indicating a requirement for additional pre-authentication. It is usually used to notify a client of which key to use for the encryption of an encrypted timestamp for the purposes of sending a PA-ENC-TIMESTAMP pre-authentication value.<br>Never saw this Pre-Authentication Type in Microsoft Active Directory environment. |
| 20 | PA-SVR-REFERRAL-INFO | Used in KDC Referrals tickets. |