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415 Unsupported Media Type on HTTP PUT even if Content-Type header set

Using the HTTP connector in a flow in Power Automate, we are attempting to PUT changes to a third-party REST API. The query works without a hitch in Postman, but when attempting the same in Power Automate the service returns 415 Unsupported Media Type {  "message""Content-Type header should have application/json",  "code""invalid_content_type" }


We would have thought adding the header manually as per below would take care of it, but it continues to fail with the same message. Any suggestions?






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