According to Osho, if deep awareness does not explode into samadhi it is because it is not awareness at all but thinking, especially result-oriented anxiety about achieving samadhi. Awareness is always here-now; thinking projects into the future and becomes the sole barrier. When awareness is total, lived, and unmotivated, the explosion happens by itself. Drop the goal, relax in the present; let being, not doing, unfold.
If samadhi isn’t happening, you’re probably thinking about it and chasing a result; real awareness is just being fully here-now, and then it happens by itself.