• Microsoft Outlook For Mac 2016 To Many Services Error
• Microsoft Outlook For Mac 2016 To Many Services Errors

Fix for the POP email problem RECEIVED this morning. It shows version 16.0.6568.2036 (unless you click on 'About Outlook' where it shows Microsoft Outlook 2016 MSO (16.0.6528.1017) 32-bit. This problem should never have been released to begin with, and it should have been fixed much faster. One of my users has exactly the same issue and it happens once or twice a day. When Outlook is restarted it is resolved usually. Notes: She is using one of the most recent versions of Outlook for Mac 2016 (16.9 or higher) She is running macOS Sierra 10.12.6; She is thus far the only person in our organization experiencing this.

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Symptoms

Microsoft Outlook For Mac 2016 To Many Services Error

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.

Microsoft Outlook For Mac 2016 To Many Services Errors

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. 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.

9. Quit Keychain Access.

   Note

   When you start Outlook, you are prompted to authenticate.