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).

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Author: PeteLong

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  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
  2. Worked a treat with a client battling this issue. Thanks!

    Post a Reply
    • Working perfectly.
      Thank you so much 🙂

      Post a Reply
  3. You made my day. It solved this 3 days pending issue in 10 seconds. That’s great.

    Post a Reply
  4. You saved my life ! Works like a charm !!
    Thank you !

    Post a Reply
  5. I followed the steps, restarted outlook, and am still having the same issue. I wonder what else could be causing the problem.

    Post a Reply
  6. Reg entry worked for me. THANKS!!!

    Post a Reply
  7. oh man worked like charm thanks

    Post a Reply

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