Why is sync feature not working in my phone?
I removed all my google accounts and added just one google account again. Then it synced. Getting 'access to keep is unauthorised' though. Also 'authentication is required' error was showing in play store.
Then i followed
www.nextpit.com/how-to-fix-google-play-authentication-is-required-error
Go to Settings &gt; Apps &amp; notifications
Scroll down to Google Play Store, tap it, then tap Storage &amp; cache and then Clear cache.
Do the same for Google Play Services
It worked for me.