I think this is boiling down to the quotes I was using in windows command prompt. I was using double-quotes on the outside, and all single quotes on the parameters, but it did not like that in CMD. Upon further inspection, the browser changed all the single quotes but for the ike-gateway name to %27, and had no double-quotes for the request in the browser. I changed my quotes in the cmd request to %27 as well and it worked like a charm. I wasn't opening and closing my quotes in a way command prompt could understand.
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