venv not activating with source

The environment is supposedly activated but when I try to install a package it tries to install it globally

source .venv/bin/activate.fish

which python  
/usr/bin/python

pip3 install cryptography threads  
error: externally-managed-environment  
  
× This environment is externally managed  
╰─\> To install Python packages system-wide, try 'pacman -S  
    python-xyz', where xyz is the package you are trying to  
    install.  
      
    If you wish to install a non-Arch-packaged Python package,  
    create a virtual environment using 'python -m venv path/to/venv'.  
    Then use path/to/venv/bin/python and path/to/venv/bin/pip.  
      
    If you wish to install a non-Arch packaged Python application,  
    it may be easiest to use 'pipx install xyz', which will manage a  
    virtual environment for you. Make sure you have python-pipx  
    installed via pacman.  
  
note: If you believe this is a mistake, please contact your Python installation or OS distribution provider. You can override this, at the risk of breaking your Python installation or OS, by passing --break-system-packages.  
hint: See PEP 668 for the detailed specification.