It will in time. I am not familiar with how this form of M. johnstonii looks when so young. I have a couple of larger plants, with short spines, so more like the type. These flower each year, so I have no reason to doubt your will. Mine had to get to about 7cm in diameter ((without spines) before it flowered, and it then produced a nice ring of pale pink/white flowers.
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Chris43, moderator