I would open your tablet’s web browser, and open up a private/incognito window. Then try to log in with it. If that works, you probably have some kind of corrupted cookie or something; try deleting any cookies from atheistrepublic.com on that device.
Deleted cookies, and tried logging on in an incognito window. All failed.
The security settings report that I’m logged in on my laptop, but not on my tablet. Password authentication still dies a miserable death, despite using the same credentials as my laptop login.
I’ve held off doing that in case doing so screws up logging in on the laptop. If I have to put up with not being able to access the site on the tablet, I want to keep the laptop login intact so to speak