Fix Outlook Multi-Factor Authentication Error Code: 80090016

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This error can occur when starting Outlook and Microsoft Multi Factor Authentication (MFA) attempts to re-authenticate a user. This could be because Microsoft has detected suspicious activity or just because it has been a while since the user last authenticated themselves.

Outlook with Microsoft 365

If you get the “Something went wrong” error with the Error Code: 80090016

Outlook Error

  1. Click the Continue button and sign in with your Microsoft 365 username and password
  2. Enter the MFA authentication code when you receive it
  3. Untick “Manage my Device” and then click OK if it is a personal device.

If it is a company device:

  1. Go to Settings > Account > Access work or school
  2. Select your account and click on disconnect
    Access School and Work
  3. Click on Yes to the warning
  4. Click on Connect
  5. Sign in with your email address and password
  6. Finish the Multi factor Authentication
    MFA Authentication

You are all set and your email should be working again.

Older Versions of Office

If you’re still using Office 2013 (or earlier) then you might encounter this error:

“The set of folders could not be opened”

Outlook error for office 2013

To resolve this you need to enable “Modern Authentication”

  1. Open RegEdit as an administrator
  2. Find, or create if necessary, the following two registry keys:

    Type: REG_DWORD
    Value: 1

    Type: REG_DWORD

Close RegEdit and Outlook should now be able to authenticate with MFA enabled.
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