Saved Password on Azure AD Computers
I hope I am here on the right place with my issue but form my perspektive it's unlikly a Teams Problem:
If a device is joins the Azure AD after a User logs into his Teams Account on a shared Laptop (for Presentations etc...). After he loggt out from Teams he only neets to enter his username to login in again. To prevent this you neet to disconnect the Account in Settings\Account settings\access Work or school. This is not a very confortable way and makes the Teams Network vunerable if a User Stayed logged in on a public PC.