AWS SSM not recognized as a command

Question

I have installed AWSCLI and session-manager on my Ubuntu instance and confirmed the installation based on the guides. I also configured my instance using aws configure. Now when I use

aws ssm start-session --target [target_instance_id]

But I get the error below:

usage: aws [options] [...] [parameters] To see help text, you can run: aws help aws help aws help aws: error: argument operation: Invalid choice, valid choices are....

Which tells me ssm is not configured properly. How can I resolve this?

Answer 1

You need to update awscli using this command

sudo pip install --upgrade awscli

Answer 2

I had both CLI v1 and v2 installed. Using aws defaulted to v1, which doesn't support what I needed to do.