I eventually ended up talking to one of the application developers who explained that I was using the wrong endpoint. I was using the address of the graphiql web app where you can manually run queries and the endpoint is different. I still am not clear if this is common practice, but it was the simple answer.

I did get stuck for a minute after correcting the endpoint because it kept giving me an unauthorized 401 response. I was using the --token flag to send my Auth token for the init. The documentation indicates that the default token scheme is Bearer, but I did have to specify it with the --scheme Bearer flag. Once I added that, it went through without any issue.