NitroKey 3: WebAuthn with PRF extension

Nitrokeys FIDO2 / Nitrokey 3
1

Hello,

I am building a web application that uses WebAuthn with PRF extension. Unfortunately Chrome only returns

{ prf: { enabled: true } }

without a result, when selecting the NitroKey 3 as authenticator.

I am passing options like this - of course some portions are converted to ArrayBuffer before passing it in:

{
        "challenge": "My00UOyTpB6eS8vsSHWmi1djw2Ct3fi2SGajEkGbLXA",
        "rp": {
            "name": "Test Auth - localhost",
            "id": "localhost"
        },
        "user": {
            "id": "_RVVnKP7PRvXuspkKMOzFC6k5-aNaBD2nFJhHwprLcw",
            "name": "testuser",
            "displayName": ""
        },
        "pubKeyCredParams": [
            {
                "alg": -8,
                "type": "public-key"
            },
            {
                "alg": -7,
                "type": "public-key"
            },
            {
                "alg": -257,
                "type": "public-key"
            }
        ],
        "timeout": 60000,
        "attestation": "none",
        "excludeCredentials": [],
        "authenticatorSelection": {
            "residentKey": "preferred",
            "userVerification": "preferred",
            "requireResidentKey": false
        },
        "extensions": {
            "prf": {
                "eval": {
                    "first": "lsAc73comXE="
                }
            }
        },
        "hints": []
    }

The NitroKey Firmware Version is v1.8.1 according to nitropy.

Does the NItroKey 3 actually support WebAuthn PRF extension? Am I doing something wrong?

Thanks in advance!

Kind regards,

Florian