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-->Sep 21, 2019 I just upgraded from Office 2013 Pro to Office 2016 Pro and suddenly my Exchange account kept prompting for password. Connected via VPN to local area network that my Exchange was on, went to Account Settings, Change, More Settings, Security and Unchecked Encryption: Encrypt data between Microsoft Outlook and Microsoft Exchange. For more useful information about Microsoft Office 2016 for Mac please see our article about the software suite. NOTE: Microsoft Office 2016 becomes end of life on. Check for an update now: Open Word, Excel, PowerPoint or Outlook and select 'Check for Updates' from the 'Help' menu.
Symptoms
In Microsoft Outlook 2016 for Mac, you are repeatedly prompted for authentication while you're connected to your Office 365 account.
![Microsoft office 365 Microsoft office 365](/uploads/1/2/6/3/126356870/606555207.gif)
Cause
This issue occurs because of the presence of duplicate tokens in the keychain.
Microsoft Office 365
Resolution
![Software Software](/uploads/1/2/6/3/126356870/146618265.png)
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
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These steps affect all Office applications that use modern authentication.
Microsoft Office
- Quit Outlook and all other Office applications.
- 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.
- In the search field in Keychain Access, enter Exchange.
- 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.
- In the search field, enter adal.
- Select all items whose type is MicrosoftOffice15_2_Data:ADAL:<GUID>, and then press Delete.
- In the search field, enter office.
- Select the items that are named Microsoft Office Identities Cache 2 and Microsoft Office Identities Settings 2, and then press Delete.
- Quit Keychain Access.NoteWhen you start Outlook, you are prompted to authenticate.