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Begin username-first passkey authentication

POST 

/api/v1/auth/passkeys/authentication/start

Requires same-origin JSON. Credential descriptors are padded and unknown usernames receive decoys; the one-use ceremony state remains server-side and expires after five minutes.

Request​

Responses​

One-use WebAuthn request options

Response Headers
    X-Request-Id

    Opaque request correlation identifier. ProblemDetails.requestId carries the same value on JSON failures.