I believe I’ve found a hole in the quick install instructions for mac. Conda only has an osx-64 platform for openmc, whereas if a user tries to install with conda on an Apple silicon ARM-based chip, it will automatically try to install with the osx-arm64 platform and result in the package not being found.
To fix this issue, I just had to create the environment in an osx-64 platform with conda create --name openmc-env --platform osx-64 openmc .
Until the osx-arm64 installer is available, it would be nice to have that mentioned in the guide. Thanks!