There is plenty of coin in the demo account and it was attempting to execute one unit of the ES. I have another strategy running which is currently short the EURUSD 272,580 units. Margin has been set to 1:1000 for the demo account, so the margin should be well in the bounds of the demo account.
BTW, I tried to increase the demo account cash balance but it doesn't reflect in the account status tab.

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