Create Session With API Authentication Issue

I am trying to run a function using the cognite API. My understanding is that in order to do that I must first create a session to get the nonce. I am running into an error when I try and post to that api: 

HTTPError: 401 Client Error: Unauthorized for url: https://az-eastus-1.cognitedata.com/api/v1/projects/pinnacle-dev/sessions

I have confirmed that my group has permission to create sessions, I have confirmed that I am able to do other things with the api such as list assets, and also I am able to create a session in the SDK using client.iam.sessions.create() using the same client_id and client_secret. Any ideas where the authentication error would be coming from?

Here is what my code looks like
 

url = f"{BASE_URL}/sessions"

print(url)

headers = {

    'Autherization': f"Bearer {access_token}",

}

data = {

    'items' : [

        {

            'clientId': CLIENT_ID,

            'clientSecret': CLIENT_SECRET,

        },

    ]

}

response = requests.post(url, headers=headers, data=data)

response.raise_for_status()