I am using the API documentation located here to build an offboarding automation process in Power Automate. My request looks likes this:

My issue is that I'm getting this error when this request runs:
{
"key": "badRequestFormat",
"context": {
"message": "Invalid content type (application/octet-stream). These are valid: application/json"
},
"errorKey": "bad-request-format",
"errorDetail": {
"message": "Invalid content type (application/octet-stream). These are valid: application/json"
}
}
The content-type header is supplying the exact information that the error message is referring to so I'm not sure why it's throwing this error. I've contacted Jira support and they are confident that the issue lies on the Power Automate side of things. I've also hit a brick wall with Microsoft support.
Has anyone else had this issue? Is there a way to change the request so that the content-type is accepted or any other workaround?