AWS Lambda calling coinapi throws "HTTP Error 401: Unauthorized"

I am trying to call coinapi from aws lambda python to get the price of a bitcoin I got new API key from coinapi

   from urllib.request import Request, urlopen
   import json
   from pprint import pprint

   def lambda_handler(event, context):
       pprint('received request: ' + str(event))
       date_input = event['currentIntent']['slots']['Date']
       print(date_input)
       btc_price = get_bitcoin_price(date_input)
       #pprint(dir(urllib.request))


  def get_bitcoin_price(date):
      print('get_bitcoin_price, date = ' + str(date))
      request = Request('https://rest.coinapi.io/v1/ohlcv/BITSTAMP_SPOT_BTC_USD/latest? 
      period_id=1DAY&limit=1&time_start={}'.format(date))
      #pprint(dir(request.add_header))
      request.add_header('X-CoinAPI-Key', 'ACBDCAC9-63DC-4AD8-A72C-FBDB0DB67858')
      response = json.loads(urlopen(request).read())
      return response[0]['price_close']

I am getting the Unauthorized error:

{
    "errorMessage": "HTTP Error 401: Unauthorized",
    "errorType": "HTTPError",
        "requestId": "b4cdc286-4f62-4d57-9bd8-1b2a3c1e47d3",
        "stackTrace": [
        "  File \"/var/task/lambda_function.py\", line 9, in lambda_handler\n    
        btc_price = get_bitcoin_price(date_input)\n",
        "  File \"/var/task/lambda_function.py\", line 18, in get_bitcoin_price\n    
        response = json.loads(urlopen(request).read())\n",
        "  File \"/var/lang/lib/python3.9/urllib/request.py\", line 214, in urlopen\n    
        return opener.open(url, data, timeout)\n",
        "  File \"/var/lang/lib/python3.9/urllib/request.py\", line 523, in open\n    
        response = meth(req, response)\n",
        "  File \"/var/lang/lib/python3.9/urllib/request.py\", line 632, in 
        http_response\n    response = self.parent.error(\n",
        "  File \"/var/lang/lib/python3.9/urllib/request.py\", line 561, in error\n    
        return self._call_chain(*args)\n",
        "  File \"/var/lang/lib/python3.9/urllib/request.py\", line 494, in _ 
            call_chain\n    result = func(*args)\n",
        "  File \"/var/lang/lib/python3.9/urllib/request.py\", line 641, in 
        http_error_default\n    raise HTTPError(req.full_url, code, msg, hdrs, fp)\n"
    ]
}