Unauthorized request 401

Hi,

I am trying to update user attributes by using cio.identify(id=‘b1323111’, email=’test@test.com’) (id and email here are just for example)




but I am getting this error

Error executing function: Failed to receive valid response after 3 retries.
Check system status at http://status.customer.io.
Last caught exception -- <class 'customerio.client_base.CustomerIOException'>: 401: https://track-eu.customer.io/api/v1/customers/ad6c7690-a650-4a89-bf32-9a532fcf97a7 {'email': 'Taylorannpromo@gmail.com'}

{ "meta": { "error": "Unauthorized request" } }

I am using EU data center and using the correct api 

cio = CustomerIO(site_id, api_key, region=Regions.EU)

using the same api key for post customers api to get the customers from customer io that one is working but cio.identify is not working, 

I am using python sdk 

would really appreciate any help from the community.

Thanks