We are investigating login issues impacting #WizardsUnite players after they download the 2.7.0 update. Please stay tuned for updates. Thank you for your patience.

— Niantic Support (@NianticHelp) November 19, 2019

Wizards can’t login if they updated HPWU today. You would think “logging in” is one of those things that would fall on their list of acceptable criteria to test before shipping it but what do I know?