Outlook: Something Went Wrong Error 80090016

KB ID 0001549


When attempting to open Outlook you see this error;

Outlook Error 80090016

Something went wrong
Your computer’s Trusted Platform Module has malfunctioned. If this error persists, contact your system administrator with this error code 80090016


Note: The this won’t affect users who are subject to MFA (Multi Factor Authentication,) so this can be enabled to solve this problem. 

On the affected machine, run regedit and navigate to;

HKEY_CURRENT_USER > Software > Microsoft > Office > 16.0 > Common > Identity

Create a new DWORD (32 Bit) Entry

  • Name: EnableADAL
  • Value: 0 (that’s a Zero)

Outlook EnableADAL

What does this do?: It disables ‘Modern Authentication’.

Then restart Outlook. (Note: It may re-prompt for a password).

Related Articles, References, Credits, or External Links


Author: PeteLong

Share This Post On


  1. “What does this do?: It enables ‘Modern Authentication’.”

    Disables, Shirley?

    Post a Reply
    • Hi Bruce (correct! – need more coffee)
      – And don’t call me Shirley! 🙂


      Post a Reply

Submit a Comment

Your email address will not be published. Required fields are marked *