Verwalten von Präsenzindikatoren wie z. B. Verfügbar, Beschäftigt oder Abwesend, um die Verfügbarkeit von Benutzern zu reflektieren
Hello Leona N,
Thank you for reaching out to the Microsoft Community. My name is Eunice and I am happy to assist you today.
I am sorry you are experiencing this issue. Please know that Microsoft Teams is experiencing issue currently and Microsoft is currently working on resolving the issue. The issue "Users may be unable to sign into the Microsoft Teams Windows desktop app"
You can check update from Microsoft service status: https://portal.office.com/servicestatus
Let me know if you need more help.
Kind regards Eunice