- If your account is in a domain environment,
- Password expire,
- Account locked will cause to get white window in Teams.
- Teams not get your credential properly (To avoid that follow the below instruction).
In that above situation web view might be working under your cloud policy but not working in a PC.
- If not,
- Internet connection is not fast enough.
- Your account is not registered under "Emails & Accounts".
- Windows Key/Settings/Accounts/Emails & Accounts (Windows 10)
- Teams not get your credential properly,
- To avoid that Sign-out and Sign-in
- Using right click on the "Teams" icon in the task bar.
And make sure your Microsoft Teams is up to date to prevent the several issues.