> ## Documentation Index
> Fetch the complete documentation index at: https://auth0.generaltranslation.app/llms.txt
> Use this file to discover all available pages before exploring further.
# MfaWebAuthnPlatformChallenge
```ts Example theme={null}
import MfaWebAuthnPlatformChallenge from "@auth0/auth0-acul-js/mfa-webauthn-platform-challenge";
const mfaWebAuthnPlatformChallengeManager = new MfaWebAuthnPlatformChallenge();
```
## Constructors
Initializes a new instance of the `MfaWebAuthnPlatformChallenge` class.
It retrieves the necessary context (screen, transaction, etc.) from the global `universal_login_context`.
#### Throws
If the Universal Login Context is not available or if the screen name
in the context does not match `MfaWebAuthnPlatformChallenge.screenIdentifier`.
## Properties
BrandingMembers} />
ClientMembers} />
OrganizationMembers} />
PromptMembers} />
ScreenMembersOnMfaWebAuthnPlatformChallenge} />
TenantMembers} />
TransactionMembers} />
UntrustedDataMembers} />
UserMembers} />
static
## Methods
Error[]}>
Retrieves the array of transaction errors from the context, or an empty array if none exist.
An array of error objects from the transaction context.
Reports a browser-side error encountered during the WebAuthn `navigator.credentials.get()` operation.
This method should be called when `verify()` fails due to a WebAuthn API error (e.g., user cancellation).
It sends the error details to the server with a specific action format.
A promise that resolves when the error report is successfully submitted.
#### Throws
Throws an error if the form submission fails (e.g., network issue, invalid state).
MfaWebAuthnPlatformChallengeReportErrorOptions}>
Contains the `error` object (with `name` and `message`
properties from the browser's WebAuthn API DOMException) and any other custom options.
The `error` object will be JSON stringified and embedded in the `action` parameter.
**Properties**
WebAuthnErrorDetails}>
The error object from the WebAuthn API (`navigator.credentials.get()`) to be reported.
Allows the user to opt-out of the WebAuthn platform challenge and select a different MFA method.
This action submits `action: "pick-authenticator"` to Auth0, which should navigate
the user to an MFA factor selection screen.
A promise that resolves when the 'pick-authenticator' action is submitted.
#### Throws
Throws an error if the form submission fails (e.g., network error, invalid state).
MfaWebAuthnPlatformChallengeTryAnotherMethodOptions}>
Optional. Any custom parameters to be sent with the request.
Initiates the WebAuthn platform authenticator challenge.
Internally, this method retrieves the challenge options from `this.screen.publicKey`,
calls `navigator.credentials.get()` (via the `getPasskeyCredentials` utility),
and then submits the resulting credential assertion to the Auth0 server.
A promise that resolves when the credential submission is initiated.
A successful operation typically results in a server-side redirect.
#### Throws
Throws an error if `this.screen.publicKey` is not available (indicating missing challenge options),
if `getPasskeyCredentials` (and thus `navigator.credentials.get()`) fails (e.g., user cancellation,
no authenticator found, hardware error), or if the final form submission to Auth0 fails.
It's crucial to catch errors from this method. WebAuthn API errors (like `NotAllowedError`)
should ideally be reported using `this.reportBrowserError()`.
VerifyPlatformAuthenticatorOptions}>
**Properties**