Need Help: Uploading Datasets to Deployed Phoenix Server

Sorry if I missed this in the docs, but is there example code for uploading datasets and running experiments to a deployed phoenix server? I tried doing this but it didn't work:

phoenix_client = px.Client(
  endpoint="https://app.phoenix.arize.com",
  api_key=PHOENIX_API_KEY
)
dataset = phoenix_client.upload_dataset(
  ...
)

The error I get is: HTTPStatusError: Client error '401 Unauthorized' for url 'https://app.phoenix.arize.com/v1/datasets/upload?sync=true'