PM3 Easy not showing up in Device Manager

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Proxmark3 Easy HF Issues (MAC OSX)

From our MacOS guide… I think you need to do this bit; Building proxmark3 Prior to building, we need to make a change to ensure the build scripts build for the Easy. On Windows or Linux, you’d change this in the Makefile.platform, but on Mac OS, as we’re using Homebrew, we export it as an environment variable. export HOMEBREW_PROXMARK3_PLATFORM=PM3OTHER

Assuming that you are using homebrew on mac then you can follow the information above.