Uncertified device

[AmanAcharya]

In Google Playstore settings, it shows uncertified under Device certification. 

[Lord_viridis]

Hi @AmanAcharya

If you check here https://support.google.com/googleplay/answer/7165974?hl=en

It will help explain what that term means,

But just to clarify, have you made any software modifications such as rooting, non stock room etc?

[AmanAcharya]

No i have not done any software modification on my device and also not rooted it

[Lord_viridis]

Where was the device purchased from?

Have you updated the most recent Google play services update.

Lots of variables to trt to resolve this for you.