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EA not printing to journal

Hi, I am toying with MQL5 and wanted to print some info to the journal. This should happen in OnInit() Print(" Symbol selected: " + Symbol()); Now my expectation is that this msg is printed in the journal when I attach the EA. However, nothing happens other than: 2020.09.20 13:26:23.209 Experts

0

MarketBookAdd -> Depth Of Market can not be added (4901)

Hi, I am trying to use MarketBookAdd but it fails for: "DE30Index". How can I diagnose that problem? Could it be that I am using a test account? Is there somewhere I need to enable DOM first? Thank you