[Python] Getting "externally-managed-environment" error while using a venv

I am trying to write a python script on an Ubuntu box. I had it working fine on another box, but now cannot get it to install some libraries. Keep getting the "externally-managed-environment" error.

However, I am using a venv.

Python 3 is installed.

I've run:

apt install python3-pip -y


and

apt install python3-venv


Create the venv:

python3 -m venv sensu-venv


Activate it

source sensu-venv/bin/activate


So now my prompt looks like

(sensu-venv) ubuntu@ip-xxx-xxx-xxx-xxx:~/listener


Output of which python3 is "/home/ubuntu/listener/sensu-venv/bin/python3"

I have then run every combination of pip install but get the same result:

python -m pip install pika --upgrade
python3 -m pip install pika --upgrade
pip install pika --upgrade
pip3 install pika --upgrade


But always get the externally managed error.

Have tried deactivate/delete the venv subdirectory, recreate.

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