This will only work if you use intrabar data during backtesting or use the M1 timeframe as a whole for your strategy. Otherwise FSB only uses bar open to check if the indicator conditions apply. E.g., if you use H1, it checks if the conditions apply at 16:00, 17:00, 18:00, etc. So if you specify 18:02 as the entry time, the condition will never apply during a backtest, hence you get no trades at all.