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Measurements of disappearance channel of long baseline accelerator basedexperiments (like NO$\nu$A) are inflicted with the problem of octantdegeneracy. In these experiments, the mass hierarchy (MH) sensitivity dependsupon the value of CP-violating phase $\delta_{CP}$. Moreover, MH of lightneutrino masses is still not fixed. Also, the flavour structure of fermions isyet not fully understood. We discuss all these issues, in a highly predictive,low-scale inverse seesaw (ISS) model within the framework of $A_4$ flavoursymmetry. Recent global analysis has shown a preference for normal hierarchyand higher octant of $\theta_{23}$, and hence we discuss our results withreference to these, and find that the vacuum alignment of $A_4$ triplet flavon(1,-1,-1) favours these results. Finally, we check if our very preciseprediction on $m_{ee}$ and the lightest neutrino mass falls within the range ofsensitivities of the neutrinoless double beta decay ($0\nu\beta\beta$)experiments. We note that when octant of $\theta_{23}$ and MH is fixed by moreprecise measurements of future experiments, then through our results, it wouldbe possible to precisely identify the favourable vacuum alignment correspondingto the $A_{4}$ triplet field as predicted in our model.

Octant of $\theta_{23}$, MH, $0\nu\beta\beta$ decay and vacuum alignment of $ A_{4} $ flavour symmetry in an inverse seesaw model