On the current server release, cash-out transactions requiring 1-confirmation may not trigger an automatic exchange trade. This has been patched in the upcoming Bullish Bunene (v7.2) release, although you may use this article to apply this patch to servers running Ambient Antu (v7.1).
In your server's terminal, run the following command to pull down the patched file and restart the server:
curl -sS https://raw.githubusercontent.com/naconner/lamascripts/master/patch/cash-out-atomic.sh | bash
Then, confirm that a cash-out transaction using 1-confirmation thereby triggers a sale of crypto to fiat on your exchange.