Microsoft Teams with Azure Active Directory Authentications

I was referred by Office 365/Teams community to Azure Active Directory Forums with my odd Teams log in issues.

https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_teams-mso_o365b/cannot-log-on-to-microsoft-teams-client/910c6c9c-0a3a-4152-a9a9-25c1eac3a8b0

We are having problem when logging in to Teams with Azure Active Directory authentications. 

Scenario 1:

UserA has a domain joined ComputerA on internal network (his own computer) and he can log on to Teams without any problems even completely close it and relaunching Teams.   

UserA try to log on to a domain joined ComputerB on Internet Network (first time log on to that computer) and he will get a blank screen after putting his company username@domain.com sign-in address. 

UserA can do two things after seeing the blank screen.

1. UserA clicks two times to force close the blank log in screen then the following screen pop up. He can type in his company username@domain.com and password. It will sign in successfully all the way. However, he will get the same blank log in screen again after relaunching Teams again.
2. UserA can just wait for 10 minutes while seeing the blank screen. The following screen will auto pop up and ask for credential to sign in to Teams. UserA sign in with his company username@domain.com and he can successfully log in to Teams. However, he will get the same blank log in screen after relaunching Teams again.

Scenario 2:

-          UserA restart ComputerB and then connect ComputerB to a hotspot and connect to external network and launch Teams. He will then get the following log in screen. 

UserA type in his company username@domain.com and he can successfully log in to Teams. He can even log in to Teams without asking for user name and password and after relaunching Teams.  UserA then put the ComputerB back to internal network and he can log in with Teams just fine without asking for user name and password. 

Scenario 3:

UserA changed his domain password on a domain joined computer and he will get the following error from Teams.

UserA then click on "Signing out" and trying to sign back in. Then he will encounter the following "Nor Responding" log in screen (very similar like the blank screen".

 The only way for UserA to update the password will be connect the computer to a hotspot on external network to update the new sign in password. Teams works fine after putting that computer back from hotspot to internal domain joined network.