@mcopeland Hi, please could you try the below, replacing the <Your password> with your password this should obtain a 200 OK then the Token is found in the "value" key in the response:

import requests

url = "https://selectapi.datascope.refinitiv.com/RestApi/v1/Authentication/RequestToken"

payload = "{\r\n    \"Credentials\": {\r\n        \"Username\":  \"9033378\",\r\n        \"Password\":  \"<Your password>\"\r\n    }\r\n}"
headers = {
  'Prefer': 'respond-async',
  'Content-Type': 'application/json; odata=minimalmetadata'
}

r = requests.request("POST", url, headers=headers, data=payload

print ('POST /session Token', r.status_code, r.reason)