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You should point the payload to your exchange server address. Just treat it the same way you would if you were manually creating a profile on your device/s.
It turns out that I was confused as to the nature of the landesk gateway. I thought the gateway (CSA) was going to function like a proxy for our exchange server. Our current MDM has an appliance that does something similar. But that's not the case with the gateway. Currently, our exchange isn't accessible to the outside, so obviously it wasn't going to work.