Problems connecting to EC2 instance using EC2 instance connect endpoint

I followed this guide (https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/permissions-for-ec2-instance-connect-endpoint.html). I can connect to the instance using the console but can't connect using AWS CLI. This is the output I get.

aws ec2-instance-connect ssh --instance-id i-0daa56a4c6ce5578d

usage: aws [options] <command> <subcommand> [<subcommand> ...] [parameters] To see help text, you can run:

aws help aws <command> help aws <command> <subcommand> help

aws: error: argument operation: Invalid choice, valid choices are:

send-ssh-public-key | send-serial-console-ssh-public-key help

When I use the valid choices provided above, this is what I get

aws ec2-instance-connect send-ssh-public-key --instance-id i-0daa56a4c6ce5578d --availability-zone us-east-1a --instance-os-user ec2-user --ssh-public-key file://my_key.pub { "RequestId": "fa460a07-0df4-4886-bcc0-7eaf808f3cf6", "Success": true }

Where should I go from here?