There are a number of factors.
Seasoning needs to be strong with the addition of both an acid (lemon juice) and a sugar (maple syrup). For 2 cups of flour I would use 3 TBS of herbs and spices (chilli, sage, oregano, cumin etc), 1 stock cube, 1 tbs each of miso, acid and sugar + 2 tsp each of salt and pepper. You also need a fat like 2-3 tbs veg oil.
Secondly, you need to cook it for a lot longer than you think or most recipes suggest. Baking wrapped in foil in the oven or steaming is about 90 minutes, flipping halfway through. Simmering in broth is generally hard to do as it easily gets waterlogged -- I just don't do it and stick to baking or steaming, tightly wrapped in foil.