If you owns an Android smartphone, there’s possibility of receiving an error message saying Google Play Authentication Required. But if you are here just because you are seeing this error be rest assured that you’ve gotten to the right place to resolve the issue;
REMOVE YOUR GOOGLE ACCOUNT
This error might have occur because of a sign-in problem. The first thing to do is to go to Settings > Accounts, then remove the Google account that you signed in with before that is getting the Google Play authentication Required message. After that, re-add the account.
This issue could be because things are not syncing properly from your phone. Head-up to Settings > Accounts > Google, then tap on your email address, and then press Sync All. You can go back to the Play Store after that to see if the error message as disappeared. If it isn’t, continue reading!
CLEAR DATA FROM THE GOOGLE PLAY STORE
To do this, go to Settings > Applications, then locate the Google Play Store app. tap on it, then select Clear Data. This should work, than the previous steps, if it did not, Continue reading!
DOWNLOAD AN APP USING YOUR MOBILE BROWSER
Open your mobile web browser and visit the Play Store website from it. then try to download an app directly, rather than using the Play Store app.
UNINSTALL PLAY STORE UPDATES
Sometimes, the problem might not be from the sign-in attempts. It might just be that the Play Store app is malfunctioning. To resolve this, tap on Settings > Applications, then select Play Store. After that, tap on Uninstall Updates, which will roll back the app to its factory version.
Now, install the latest version of the Google Play Store and sign in again.
If the Google Play Authentication Required error message doesn’t disappear after going through all the above steps, you might have to do a factory reset on your phone.