I am submitting the JWT with required payload to https://api.development.devicecheck.apple.com/v1/validate_device_token. However Apple's development devicecheck server always returns http response 401 - Unable to verify authorization token.  I generated the token following the instructions in https://developer.apple.com/documentation/appstoreconnectapi/generating_tokens_for_api_requests and check token by curl -v -H 'Authorization: Bearer [signed token]' "https://api.appstoreconnect.apple.com/v1/apps" I can use that token to call this API successfully. However, when I tried to use exactly the same token to verify a device ID, I got a 401 response here is my payload for the request https://api.devicecheck.apple.com/v1/validate_device_token It's my code: now = int(time.time()) expire_time = now + 20 * 60 HEADERS = { 		"alg": "ES256", 		"kid": kid, 		"typ": "JWT" } PAYLOAD = { 		'exp': expire_time, 		'iss': iss, 		'aud': "appstoreconnect-v1" } jwt_token = jwt.encode(PAYLOAD, private_key, algorithm='ES256', headers=HEADERS).decode('utf-8') auth = 'Bearer {}'.format(jwt_token) headers = { 		'Content-Type': 'application/x-www-form-urlencoded', 		'Authorization': auth } response = requests.get( 		'https://api.appstoreconnect.apple.com/v1/apps', 		headers=headers ) print(response.status_code) print(response.text) request_file = '.../ValidateDeviceTokenRequest.json' data = None with open(request_file) as json_file: 		data = json.load(json_file) data['timestamp'] = (now) * 1000 response = requests.post( 		'https://api.devicecheck.apple.com/v1/validate_device_token', 		data=json.dumps(data).encode(), 		headers=headers ) print(response.status_code) print(response.text)