Python 3.7 in Conda env on M1

Question

Trying to use Python3.7 in a new environment in Conda. I installed the x86_64 version of brew into the default location (/usr/bin) alongside the arm64 version (3.7 isn't available on arm64). I was able to install Python3.7 via the x86_64 brew, and it shows up in VSCode as a Python interpreter.

This is the environment.yml:

name: aiclass
channels:
  - defaults
dependencies:
  - python=3.7
  - tk
  - numpy
  - pillow
  - pytorch

but I get ResolvePackageNotFound: - python=3.7

I also set pyenv global 3.7.16 and that works.

Can I specify other Python installations to Conda? Or install from a different channel other than conda-forge?