By any chance do you utilize the option to change keyboard layouts as a result of typing in more languages than just English? I have had issues like yours in the past, but mine was caused by me forgetting to switch my keyboard layout and language back to English (US) qwerty before changing my passwords, so when I would try logging in with my new password I would get the same stonewall attitude from my device that you seem to be getting now with your S7. These days I don't get hung up on solving unexplainable anomalies anymore. With our own government getting cyberattacked I just accept that resetting my phone or PC regularly is how I avoid the frustration. I know your S7 is new, but as crafty as hackers are these days, and from my own experience of having to reset my new laptop after the initial setup mysteriously failed 🙄 I just accept that there's always a possibility of unknowns who lurk out on the web and practice their nefarious douche-baggery. Hope you figure out the issue but don't hesitate to start with a fresh install, especially now that your tablet is new and you haven't fully set it up. A reset would be smooth and maybe it'll resolve the difficulty you're having adding multiple gmail accounts.
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