Merge pull request #25482 from microsoftgraph/webauthnpublickeycredentialcreationoptions

Update webauthnpublickeycredentialcreationoptions.md - challenge is a Base64-encoded string

Author: Lauragra

api-reference/beta/resources/webauthnpublickeycredentialcreationoptions.md

@@ -21,7 +21,7 @@ Defines public key options for the creation of a new public key credential. For
 |:---|:---|:---|
 |attestation|String|Attestation preference for the Microsoft Entra ID relying party.|  
 |authenticatorSelection|[webauthnAuthenticatorSelectionCriteria](../resources/webauthnauthenticatorselectioncriteria.md)|Properties of WebAuthn authenticators allowed to be used for authentication in Microsoft Entra ID.|  
-|challenge|String|A challenge generated by Microsoft Entra ID and sent back with the registration request to prevent replay attacks.|  
+|challenge|String|A Base64-encoded challenge generated by Microsoft Entra ID and sent back with the registration request to prevent replay attacks.|  
 |excludeCredentials|[webauthnPublicKeyCredentialDescriptor](../resources/webauthnpublickeycredentialdescriptor.md) collection|List of credentials blocked for creations in Microsoft Entra ID.|  
 |extensions|[webauthnAuthenticationExtensionsClientInputs](../resources/webauthnauthenticationextensionsclientinputs.md)|Additional processing required by Microsoft Entra ID for the client and WebAuthn authenticator. For example, Microsoft Entra ID might require that particular information be returned in the attestation object.|  
 |pubKeyCredParams|[webauthnPublicKeyCredentialParameters](../resources/webauthnpublickeycredentialparameters.md) collection|A set of preferred credential properties for the creation of a new public key credential in Microsoft Entra ID.|