I'm having trouble getting my API flow to work.
The API flow only receives a request body in JSON, which I want to then pass to another API in its entirety.

In the API call, the first step of the API Flow, I simply have the Body as $(input.MSCRM_OrderRequest} . I've also tried it with quotes around it.
When I paste my example JSON request in the Test tab for this API step, as the value of input.MSCRM_OrderRequest, I get a successful response. However, when I paste the same JSON request into the test tab of the API Flow as a whole, the API fails.
The failure error is:
Failed to call mingle-ionapi.inforcloudsuite.com/.../flowdefreq. Code is : 400 Error: Activity CreateEntireOrder failed with reason Bad Request and status 400 body {error={code=0x80060888, message=Invalid object provided in the request.}}
More screenshots:
(Flow test does not get past the first API.)
(API test works)
(API Flow Test fails with same input)