Failed to re-write Device Token generation function in PHP & Laravel

[EvanEvan-17]

I'm trying to rewrite Device Token generation function in PHP & Laravel from this library, but it failed. Can you please check my code, what's wrong with it?

$serviceProofKey = [
            'crv' => 'P-256',
            'alg' => 'ES256',
            'use' => 'sig',
            'kty' => 'EC',
            'x' => 'b8Zc6GPFeu41DqiWPJxRa_jqUTSiMA537emKVHt8UO8',
            'y' => 'CXAuTEHet72GjgSDfDg6psBrwE1waxBsNEIGrRZV_90'
        ];
        $response = Http::withHeaders([
            'Signature' => 'AAAAAQHW6oD31MwA6MAjn67vdCppWCbrMovubA85xejO06rtOAEdZ0tMTZFnu7xbI6lZDNvIWfuMaIPJSUcpvxjKqSFJl1oaWzQGBw=='
        ])->withUserAgent('XboxReplay; XboxLiveAuth/4.0')->post('https://device.auth.xboxlive.com/device/authenticate', [
            'RelyingParty' => 'http://auth.xboxlive.com',
            'TokenType' => 'JWT',
            'Properties' => [
                'AuthMethod' => 'ProofOfPossession',
                'TrustedParty' => 'https://xboxreplay.net/',
                'Id' => '{21354D2F-352F-472F-5842-5265706C6179}',
                'DeviceType' => 'Win32',
                'Version' => '10.0.18363',
                'ProofKey' => $serviceProofKey
            ]
        ]);
        dd($response->json());

The Http class is a Laravel class that used to call the API.