In-app Purchase Error While Retrieving Information From Server [df-aa-20] - Android

I am trying to enable in app billing. I've created In-app-products on my google play console and got my license key. When I try to purchase product I get this image error. in-app p

Solution 1:

The possibility of error,

• Need to upload app on the app store for the beta, alpha or live version at least once.
• Uploaded app on play store app version and testing app version should be same,
• Please verify created product id and requesting product id same or not,
• Also finally verify product are active or Inactive, If Inactive then active it.