How to use provider certificate to connect to APNs (MissingProviderToken)

Hi, I'm building an app to build and update a wallet pass.

I want to send a push notification to the Wallet app to update the pass, but I got the following error.

:status: 403 
apns-id: 3EDEDFEA-C8F1-215A-D9F3-2FA7D6C5AF0C 
{reason: MissingProviderToken} 

I am using the certificate and authentication header like this.

var storage = admin.storage().bucket()
            var signerCert = (await getRawBody(storage.file('signerCert.pem').createReadStream())).toString();
            var signerKey = (await getRawBody(storage.file('signerKey.pem').createReadStream())).toString();
            // 方法１（クライアント立てる）
            const client = http2.connect(url);
            client.on('socketError', (err) => console.error('ソケットエラー！',err));
            client.on('error', (err) => console.error('エラー！',err));
            var header = {
                'Authrorization': 'Bearer '+pushToken
            }
            const req = client.request({ 
                ':method': 'POST',
                ':path': path,
                'cert': signerCert,
                'key': signerKey,
                'passphrase': '',
                'headers': JSON.stringify(header),
            });
            req.on('response', (headers, flags) => {
                for (const name in headers) {
                    console.log(`${name}: ${headers[name]}`);
                }
            });
            req.setEncoding('utf8');
            let data = '';
            req.on('data', (chunk) => { data += chunk; });
            req.on('end', () => {
                console.log(`\n${data}`);
                client.destroy();
            });
            req.end();

Language is Typescript. The code sits in Cloud Functions.

Is there something wrong with the code?