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1. Microsoft Outlook For Mac 2016 To Many Services Error
2. Microsoft Outlook For Mac 2016 To Many Services Errors

An exuberant writer delivers content on different cloud discipline issues to reduce the bridge between a user and a technology. Generate technical write-ups to helps people to resolve technical glitches, which people encounter in their day-to-day life. If you have more basic usage questions with Microsoft Outlook you. Problems with POP accounts in Outlook 2016: Email is deleted from server. There are many different types of email accounts you can add to Outlook, including Microsoft 365, Gmail, Yahoo, iCloud, and Exchange accounts. Some third-party email providers, like Gmail, Yahoo, and iCloud, require you to change some settings on their websites before you can add these accounts to Outlook.

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.

Microsoft Outlook For Mac 2016 To Many Services Errors

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. 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.