'sudo pip install' is not recognized. 'pip install' is recognized.

On Ubuntu 20, I created a virtual environment(venv) like this:
sudo python3 -m venv my-env

I do activate and I get into the venv:
(code-env) mr@ubuntu:~/code-env$ sudo pip install git+https://github.com/user/c-gnmi
[sudo] password for mr:
sudo: pip: command not found

Then if I attempt without 'sudo', it is recognized but I get an error stating permission denied.
(code-env) mr@ubuntu:~/code-env$ pip install git+https://github.com/user/certain-script

Running setup.py clean for c-gnmi
Failed to build c-gnmi
Installing collected packages: six, pycparser, cffi, cryptography, grpcio, protobuf, c-gnmi
ERROR: Could not install packages due to an EnvironmentError: [Errno 13] Permission denied: '/home/c/code-env/lib/python3.8/site-packages/six.py'
Consider using the `--user` option or check the permissions.

Can someone explain how 'sudo pip install' is not recognized? I tried pip3 and same behavior.