How to collect Google Analytics Demographic data from ionic 3 app?

I'm Using This ionic plugin to collect analytcis from my ionic 3 app, i'm able to get data in analytcis console, except the demographgics data.

According the docs i had set

this.ga.startTrackerWithId('UA-xxxxxx-x')
    .then((res) => {
      this.ga.setAllowIDFACollection(true)
        .then((res) =>{console.log(res)}) //this returns true
        .catch(e=>{console.log(e)})
    })
    .catch(e => console.log('Error starting GoogleAnalytics == '+ e));

on tracker ready and its returing a promise value with true and in analytcis admin i had enabled the Enable Demographics and Interest Reports but still i'm not getting any data, this was doing in developemnt mode.

can any one tell me how can i get this data.

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