All credits to @Carrie_Gu from fyde.
To become certified with access to the play store you have to:
1 - Install a device ID apk to get this Device ID and register it on your google account.
2 - Register it here: https://www.google.com/android/uncertified/
3 - Give it a day till google approval happens. (Hours minutes or maybe 1 day not in our control).
4 - Reboot and on Android Settings try to add your google account - that should be it done for the play store to work and remember… reboot.
And also this can be done too 
however its better to yet the first post done which is the correct way.
After developer mode enabled do crosh (Open browser type ctrl alt t)
/usr/sbin/crossystem_mode-switch.sh disable-rootfs-verification