Desktop Central - Can't sign in

Desktop Central - Can't sign in

Using Desktop central on prem - version - 10.0.684.  Have users/techs set up to use 2FA (google). Saturday users reported not able to get past the login, where they needed to enter the google auth code. Server looked little frozen with windows updates. Rebooted server and after reboot, I was able to login. I still am able to login (on my computer). If other users try they can't, I can't on other computers or in private windows. I created a ticket but no one is home to respond to me. Any one have any ideas the cause or things to try? 

Thinking about disabling 2FA and trying to enable again. 

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