Mattermost redux, getToken don't work

I’m new on mattermost and I’m trying to work with mattermost redux.
I wanted to try it by following what is written on the github :
I’m trying to use “Browser usage” but when trying the login and getToken() I have a problem. I can log without problem, the mail of my account is print in chrome devTools, but the get token return no value.
Do you know why the getToken function don’t work ?