Azure AI Translator not returning Alignment data

Question

I'm trying to set up basic translation functionality with the Azure Translate API. I've got it working but I can't seem to get it to give back the alignment, despite using the 'includeAlignment'='true' parameter. Below is my code. At first I thought maybe my test sentences were too generic, so I tried using absurd random sentences, but nothing seems to work. Am I missing something?

AZURE_TRANSLATE_KEY = cloudConfig['azure_translate_key']
AZURE_TRANSLATE_REGION = cloudConfig['azure_translate_region']
endpoint = "https://api.cognitive.microsofttranslator.com/"
path = '/translate'
constructed_url = endpoint + path

params = {
    'api-version': '3.0',
    'from': 'en',
    'to': 'de',
    'textType': 'plain',
    'includeAlignment': 'true',
    'includeSentenceLength': 'true',
}

headers = {
    'Ocp-Apim-Subscription-Key': AZURE_TRANSLATE_KEY,
    'Ocp-Apim-Subscription-Region': AZURE_TRANSLATE_REGION,
    'Content-type': 'application/json; charset=UTF-8'
}

# You can pass more than one object in body.
texts_to_translate = [
    "My favorite activity is running around in the middle of traffic! But it's probably not the safest thing to do. Would you suggest an alternative?",
]

body = [{'text': text} for text in texts_to_translate]
request = requests.post(constructed_url, params=params, headers=headers, json=body)
response = request.json()
print(json.dumps(response, sort_keys=True, ensure_ascii=False, indent=4, separators=(',', ': ')))

And here's the response:

[
    {
        "translations": [
            {
                "sentLen": {
                    "srcSentLen": [
                        65,
                        46,
                        61
                    ],
                    "transSentLen": [
                        70,
                        66,
                        69
                    ]
                },
                "text": "Meine Lieblingsbeschäftigung ist es, mitten im Verkehr herumzulaufen! Aber es ist wahrscheinlich nicht das Sicherste, was man tun kann. Würden Sie eine Alternative vorschlagen, wie z.B. die Basketballjagd?",
                "to": "de"
            }
        ]
    }
]