Office 2016 For Mac Not Signing In

Activate MS Office 2019/2016 for macOS - MicrosoftOffice2019VLSerializer Office 2019 above. Note that Office2019 DO NOT support activate via simple copy/paste plist license file which is the simplest way to activate Office 2016. When a user attempts to sign into an Office 2016 application on a system running Windows 10, the sign-in window either blank or shows a 'Signing In' message with no progress: Applies To Windows 10 (build 15063.138 and later).

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Note

Office 365 ProPlus is being renamed to Microsoft 365 Apps for enterprise. For more information about this change, read this blog post.

Symptoms

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When you try to activate or sign in to any of the Microsoft Office 2016 applications after you install the version 15.33 update, you receive a blank authentication screen. Additionally, you may see any of the following symptoms.

Symptom 1

The following issues occur in the Unified Logging Service (ULS) log:

  • The server has redirected to a non-https URL.
  • Errors occur in Azure Active Directory Authentication Library (ADAL) authentication.

To locate the ULS log, open Finder and browse to the following path:

~/Library/Containers/com.microsoft.<Application>/Data/Library/Caches/Microsoft/uls/com.microsoft.<Application>/logs

Note <Application> represents the name of the application that you are troubleshooting.

Symptom 2

You notice that in an HTTP trace, the server response includes multiple WWW-Authenticate headers, such as the following:

WWW-Authenticate: Negotiate

WWW-Authenticate: NTLM

Cause

The symptoms occur for the following corresponding reasons:

2016

Cause for symptom 1

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Starting from Office 2016 for Mac version 15.33, unsecured endpoint traffic is blocked in authentication flows.

Cause for symptom 2

Starting from Office 2016 for Mac version 15.33, the authentication method no longer selects NTLM authentication when multiple WWW-Authenticate headers are present in the response. The issue occurs when the selected authentication method is unsuccessful.

Resolution

Resolution for symptom 1

Configure all authentication endpoints to use the Secure Sockets Layer (SSL) protocol.

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Resolution for symptom 2

Install the September 2017 update for Office 2016 for Mac version 15.38.

More Information

More information for symptom 1

The resolution applies when you use Microsoft Active Directory Federation Services or non-Microsoft federation solutions.

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