Yes. Martingale strategies, whether applied by increasing size on a new trade after a realised loss or by adding to an existing position while it is running at a loss, are permitted at Finotive Futures when used responsibly and within your account's standard Contract Limit, Daily Drawdown, and Max Drawdown.
Using martingale does not exempt you from any of your account's normal trading rules. Aggressive martingale sequences that create excessive account exposure, or that resemble reckless risk management or gambling behaviour rather than disciplined trading, may still be reviewed under the Gambling Behaviour and Account Rolling rule in Prohibited Trading Strategies below.