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    Client error codes

    These are the error codes that can be returned by a U2F client:

    1 - OTHER_ERROR

    An error otherwise not enumerated here.

    2 - BAD_REQUEST

    One of the following reasons:

    • The visited URL doesn’t match the App ID.

    • The App ID does not conform with the rules for App ID’s.

    • The U2F API is called with bad parameters (e.g. calling u2f.register with the parameters in the wrong order).

    3 - CONFIGURATION_UNSUPPORTED

    Client configuration is not supported.

    4 - DEVICE_INELIGIBLE

    The presented device is not eligible for this request. For a registration request this may mean that the token is already registered, and for a sign request it may mean that the token does not know the presented key handle.

    5 - TIMEOUT

    Timeout reached before request could be satisfied.