How to set “ScoreTransform” of function “fitcensemble” with "AdaBoostM2" in order to output probability when making prediction ?

I am doing Multicalssification with fitcensemble. I want to output probability as [pred, prob] = mdl.predict(X) with mdl trained by fitcensemble with "AdaBoostM2". I tried to set "Score Transform" with value "logit" and "doublelogit". However, the row sum of their outputs doesn't equal to 1. Could anyone please let me know how to probably set the ScoreTransform parameter to get probability ?