Unable to create parent nitro enclaves using aws cli

Hi,

I'm following the Hello enclave Tutorial from https://docs.aws.amazon.com/enclaves/latest/user/getting-started.html. When I try to run a instance with the following command:

aws ec2 run-instances --image-id ami-070b208e993b59cea --count 1 --instance-type c6a.xlarge --enclave-options 'Enabled=true'

I get the error message:

usage: aws [options] <command> <subcommand> [<subcommand> ...] [parameters]
...

Unknown options: --enclave-options, Enabled=true

Am I doing sth wrong or is the documentation obsolete?