Some more comments came in while I was writing that:
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Dale
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It is not a matter of waiting unfortunately. TWS immediately triggers the error "Unknown Contract" when I submit the reqHistoricalData().
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J G
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I will have a look at that ConId, but it seems Jurgen was able to get data with the newer ConId if we refer to his post.
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In my view, if Jurgen can get data and I cannot because my TWS throws errors, then something is weird and more likely IBKR related. I suspect different versions of TWS being used. I am going to try IBGateway now and will report the findings.