Why banner ads not shown

I tried to show a banner for testing but there is only a blank banner at the bottom of screen. No ad at all.

Is there additional steps required to test ads?

Thanks,

RN code:

<BannerView
          type="standard"
          placementId="abc_xyz"
          onClick={() => console.log('click')}
          onError={(err) => console.log('error', err)}
/>

My placement for this banner (removed placement ID):

[leokaessner]

Same here. Only works on devices where I’m logged in with my facebook account. For all others I get a huge increase of CPU and memory usage and app freezes

[BeckZero]

+1 same here…