Save logins similiar to Skype for Business
In S4B, you had the ability to choose to have the app remember your login credentials so that if you logged out and then back in later, the app will remember your password and not ask for you to enter it unless you need a password change or changed your password. It would also remember your passwords for multiple account (which I have as a Microsoft Partner). When you use Teams, every time you log out, you have to login in with your username and password since Teams doesn't remember your password as S4B does.
Yong Siang Ong commented
Does Microsoft Teams version 1.3.00.12058 able to save username and password after log out?