'Your session has expired' pop-ups appearing repeatedly

Teams or Outlook keeps asking you to sign in again.

Step-by-step fix · 3 steps

1
Sign out completely from the affected app and sign back in, using your correct work email — especially if you also have a personal Microsoft account on the same laptop.
2
Restart the laptop.
3
If using web versions (office.com), make sure you are not signed into multiple Microsoft accounts in the same browser — use a separate Chrome profile for work if needed.