Hi Jean! I'm so sorry that you had this experience, but I'm glad that you enjoyed the flavor of this bread. Cocoa powder doesn't inhibit fermentation, but using too much flour can.  Are you weighing your ingredients or using volume measure? We find that the most likely culprit for bread that doesn't rise and that's dense is too much flour in your cup. Here's a great blog that explains why it is so important to weigh. We hope this helps with your next loaf. Happy baking! 

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