Update whats-new-overview.md

Author: JarbasHorst

concepts/whats-new-overview.md

@@ -45,7 +45,8 @@ Use the **administrativeUnitInfos** property on [participant](/graph/api/resourc
 
 ### Identity and access | Identity and sign-in
 
-Use the [oidcIdentityProvider](/graph/api/resources/oidcidentityprovider?view=graph-rest-beta&preserve-view=true) resource and its methods to interact with OpenID Connect identity providers in a Microsoft Entra external tenant.
+- Use the [oidcIdentityProvider](/graph/api/resources/oidcidentityprovider?view=graph-rest-beta&preserve-view=true) resource and its methods to interact with OpenID Connect identity providers in a Microsoft Entra external tenant.
+- Added the [certificateBasedAuthPki](/graph/api/resources/certificatebasedauthpki?view=graph-rest-beta&preserve-view=true) resource to manage the collection of public key infrastructure (PKI) instances for the [certificate-based authentication method](/graph/api/resources/x509certificateauthenticationmethodconfiguration?view=graph-rest-beta&preserve-view=true), and the [certificateAuthorityDetail](/graph/api/resources/certificateauthoritydetail?view=graph-rest-beta&preserve-view=true) resource to access the properties of each certificate authority object within a **certificateBasedAuthPki**.
 
 ### Identity and access | Network access