Sep 28, 2015  Visit Office 2016 Quick Start Guides for Mac to download guides for the Mac versions of Word 2016, Excel 2016, PowerPoint 2016, Outlook 2016 or OneNote 2016 on Mac OS X Yosemite or El Capitan. While viewing any guide, you can save a copy of it to your computer, zoom in to get a closer look at a screenshot, or search for feature names. On this page you find the Microsoft Office 365 manual. Please read the instructions in this operator manual carefully before using the product. If you have any questions about your that are not answered in the manual, please share your question in the troubleshooting section on the buttom of this page.

Symptoms

In Microsoft Outlook 2016 for Mac, you are repeatedly prompted for authentication while you're connected to your Office 365 account.

Cause

This issue occurs because of the presence of duplicate tokens in the keychain.

Resolution

To resolve this issue in Outlook 2016 for Mac, install the February 2017 Outlook update (version 15.31.0) from the following Office website:

Workaround

To work around this issue, delete any cached passwords for your account, and also delete any modern authentication tokens from the keychain. To do this, follow these steps.

Note

These steps affect all Office applications that use modern authentication.

1. Quit Outlook and all other Office applications.

2. Start Keychain Access by using one of the following methods:

   • Select the Finder application, click Utilities on the Go menu, and then double-click Keychain Access.
   • In Spotlight Search, type Keychain Access, and then double-click Keychain Access in the search results.

3. In the search field in Keychain Access, enter Exchange.

4. In the search results, select each item to view the Account that's listed at the top, and then press Delete. Repeat this step to delete all items for your Exchange account.

5. In the search field, enter adal.

6. Select all items whose type is MicrosoftOffice15_2_Data:ADAL:<GUID>, and then press Delete.

7. Mac os high sierra manual. In the search field, enter office.

8. Select the items that are named Microsoft Office Identities Cache 2 and Microsoft Office Identities Settings 2, and then press Delete.

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9. Quit Keychain Access.

   Note

   When you start Outlook, you are prompted to authenticate.

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