From man parallel
Code:
Synopsis
parallel [options] [command] -- [argument ...]
parallel [options] -- [command ...]
so there needs to be two hyphens (--) between either the command and its arguments or between parallel and the command.
Review the man page to figure out which applies. My guess would be the first one.
Code:
$ seq 10 | parallel aws -- sqs send-message --queue-url "<queue-url>" --message-body "aws_sqs"