Sign-in issue

Hi,

I recently changed my E-mail address; changed my Norton account credentials too without any problem.

Today my tablet (Norton Mobile Security installed) asked me to sign-in returning with the old e-mail address; I updated password and E-mail and successfully confirmed on my PC but the tablet keeps returning the obsolet E-mail address.

Any suggestion to update the sign-in on my tablet or how to synchronize the E-mail address linked to my tablet with my Norton account (why doesn't it update anyway)?