Why want my Gmail sync to my galaxy s7 edge

[Android Central Question]

I brought the phone and when I try to sign n it it say that my Gmail account do to unknow account

 

[Rukbat]

Go to GMail to make sure it's there. If it is, run GMail, delete the account and add it back (as an existing account).

If it's not at GMail, you have no account under that name, so you'll have to create one.