Are you connected wirelessly on the computer to the same Asus router?
Have you tried clearing your cache from your browser and/or phone app then trying to reconnect? I would also try uninstalling the tablo app on my phone and reinstall to see what happens if just clearing the cache doesn’t work.
@kyle Did you reboot the Tablo after you switched it over to the new router? And are your other devices (PC, phone, etc) on the same network? Or are they on the old one?