You may of course consider: Am I producing debugging information? Have I activated the debug mode of the Interactive Brokers data? Is 10-seconds asking for too many when looking backwards to 2019-01-01? Am I attempting a historical download or do I want to trade real-time? Am I talking to the Fake-Data Demo, Paper Trading Account or Live Trading Account? Do I have the right data permissions? That's the minimum information you should have at hand. Algotrading involves engineering and being thorough. And sorry, comparing a Yahoo download with connecting to a live broker (even if in Fake Data mode) is not really a comparison.