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Microsoft maintains that you don't need to uninstall previous versions of Office before installing a newer release. However, if you are upgrading to Office 2016 and would like to remove Office 2011 first, see How tocompletely remove Office for Mac 2011.

The following explains how to install and activate Office 2016 on a Mac.

Installation and activation

  1. Go to Office 2016 for Mac in IUware. (You'll need to log into IUware, even if you are already logged into CAS.)
  2. Click Get product key to see your assigned product key.
  3. On the Office setup page, enter your 25-character product key from IUware, and click Get Started.
  4. On the 'Welcome to Office Online' page:
    • If you already have a Microsoft account: At Office Online, enter your Microsoft account email address and password. Proceed to step 5.
    • If you don't have a Microsoft account: Create one, as follows:
      1. At the bottom of the page, click Sign up now and complete the required fields. UITS recommends creating an account with your primary IU email address (e.g., username@iu.edu) to ensure the least margin of error.
      2. You'll receive an email message requesting verification. Follow the instructions to finish creating the account.
        If the email message does not arrive within a few minutes, use the resend email option.
      3. Log into Office Online with your newly created Microsoft account. After selecting your country/region and language, click Continue. When prompted, enter a first and last name for the account.
  5. Verify that 'Microsoft Office Home & Business 2016 for Mac' shows on your account page.
  6. On the Microsoft page, click Install to download the installation file. Alternatively, download the installation file from IUware directly.
    The Microsoft account must show the 'Microsoft Office Home & Business 2016 for Mac' registration in step 5. If this is not completed, it will not be possible to activate the Office 2016 product after installation.

    If you downloaded the .dmg file from IUware, open the Finder, select Downloads, and then open Microsoft Office 2016 Installer.pkg. Click Continue.

  7. Once Office is installed, a new window will open. Click Get started >.
  8. You will be prompted to sign in to activate Office. Select Sign In, and then enter the email address and password for the account that you activated with the Office 2016 product key from IUware.
  9. Enter your Microsoft account email address and click Next.
  10. Choose Microsoft account.
  11. Finish the activation process by signing in with your Microsoft credentials.
  12. In the 'How would you like Office to look' interface, choose Colorful or Classic, and then click Continue >. You should then have full use of Office 2016.

Troubleshooting

To troubleshoot installation or activation errors, see the Microsoft Guide.

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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

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

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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

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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:

Cause for symptom 1

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.

Resolution for symptom 2

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

More Information

More information for symptom 1

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