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Sorry was my own mistake!!!…should really review my code over and over before doing stupid questions guys.Really sorry….!!!
On the method linked to my form action i just call the action of my managment state
<form @submit.prevent="signUserIn">WRONG
instead of having called the method in my component which is the one in charge to then call the action from Vuex
<form @submit.prevent=" signingIn">CORRECT
Thanks to Renaud Tarnec for the time and interest on answer my question. And really sorry !!!
Source:stackexchange.com