[Python] How can I make a virtual environment work with pyenv?

I'm trying to use QGIS, which requires python 3.6.x.

I'm on mac on a system that already has python 2.7 and 3.7.

I tried

brew update
brew install pyenv
brew install pyenv-virtualenv
pyenv install 3.6.5


It installs just fine. Then, when I try to activate

pyenv activate my-virtualenv


I get this error

Failed to activate virtualenv.

Perhaps pyenv-virtualenv has not been loaded into your shell properly. Please restart current shell and try again.
​

I tried again with

exec $SHELL
pyenv activate my-virtualenv


And received the same error.

I executed this command in bash-3.2$ and regular terminal

if which pyenv-virtualenv-init > /dev/null; then eval "$(pyenv virtualenv-init -)"; fi


And I'm still getting the same error. How can I get an environment running that uses python 3.6?

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