Yes, I can access the vault from my laptop. I can access my Norton account from my tablet but then I receive the server error when the vault password screen appears, even before I enter my vault password. If I do enter my vault pasword, I receive a communication error. Yes, I have restarted my tablet several times.
Can you access your vault from your laptop?
Have you ever been able to log into your vault on the mobile app? Are you able to enter your email and password for your Norton Account, and then see the error after entering the vault password?
Have you tried restarting your tablet.