Elastic Beanstalk CLI not working

Some of the same answers are given here as well.
Most likely your Windows machine does not have the required PATH set.
https://stackoverflow.com/questions/41729006/unable-to-install-aws-elastic-beanstalk-cli-win10-python-3-6-pip-9-0-1

Have you completed the PATH setup as described in the following official documentation?
https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/eb-cli3-install-windows.html
The following PATH must be added to the environment variable.
Where it says "Python37", change it to the Python version on your machine.

%USERPROFILE%\AppData\roaming\Python\Python37\scripts