Why isn't the Mailgun API sending an email? (python)

I'm trying to send an email through python with Mailgun, but it isn't actually sending an email to me.

def send_simple_message():
    return requests.post(
        "https://api.mailgun.net/v3/sandbox26ec5a4187a942f6a834bb53d77d2b31.mailgun.org/messages",
        auth=("api", "apikey---"),
        data={"from": "Excited User <mailgun@sandbox26ec5a4187a942f6a834bb53d77d2b31.mailgun.org>",
            "to": ["myemail", "myotheremail"],
            "subject": "Hello",
            "text": "Testing some Mailgun awesomness!"}) ```