Getting response code 400 in https://api.revenuecat.com/v1/subscribers/{app_user_id}/subscriptions/{product_identifier}/revoke

Hi running into this error when using the Refund and revoke a Google Subscription

https://api.revenuecat.com/v1/subscribers/{app_user_id}/subscriptions/{product_identifier}/revoke

I’m getting a Response code of 400 with this body 

{
  "code": 7227,
  "message": "Content-Type not application/json"
}

I can confirm that the transaction did go through here’s the sandbox log

Now here’s my request

Note: I’ve removed the token for security purposes 

Hope someone can help!!