Missing module "_cffi_backend" in Python script

[PureLife]

I have been working on a password generation workflow for personal use, using the 'cryptography' module for Python3. It was working well on my machine and in my testing but as soon as I put it into an Alfred script, I got an error in my pass_store.py file:

ModuleNotFoundError: No module named '_cffi_backend'

I've tried every iteration of installing the packages, either into my system or into the workflow folder. Any help as to why this is happening would be greatly appreciated. Attached is a zip file of my workflow folder.

https://drive.google.com/file/d/10BiRFg_o4xHB2EBdTOb214MjWatBubvZ/view?usp=sharing