To fix M365 account issue for Trusted Platform Module (TPM) malfunction with the error code 80090016

  1. Open Command Prompt as Administrator:
    • Click on the Start menu, type cmd, right-click on the Command Prompt and choose “Run as administrator”.
    • Alternatively, press Windows Key + X and select “Windows PowerShell (Admin)” or “Command Prompt (Admin)” from the menu.
  2. Unregister the Device from Azure AD/AD (dsregcmd /leave):
    • In the administrative Command Prompt or PowerShell window, type dsregcmd /leave and hit Enter.
    • This command will unregister the device from Azure AD/AD.
  3. Reboot the Device (Optional but Recommended):
    • It’s a good practice to restart the computer after unregistering it before attempting to rejoin the directory. This ensures all changes are applied correctly.
  4. Register the Device to Azure AD/AD (dsregcmd /join):
    • Open an administrative Command Prompt or PowerShell window again after the reboot.
    • Type dsregcmd /join and hit Enter.
    • This command will register the device with Azure AD/AD.


Multi-Factor Authentication

February 2024
February 2024

Mandatory for all staff accounts

May 2024
May 2024

Mandatory for all student accounts