Aug 01, 2017 So far 15 out of our 42 active Windows Outlook users have been impacted (not counting Mac Outlook, or holiday users). Everyone is using Outlook 2016 on Windows 10, Office 365 (hybrid setup with all user boxes in the cloud). Yesterday I've had everyone delete their stored Windows 10 credentials. Jan 10, 2018 Mac Outlook 2016 and Exchange 365 Problems with erratic Syncing. Do you want to continue. If you accept this change you will lose any items that have not yet been synchronized, etc etc to accept the changes you have made and use the new mailbox, click OK', so you can then click OK or Work Offline. Please Note: Since the web site is not. Jan 09, 2016 New setup of Outlook 2016 won't accept a correct password. I'm setting up Outlook on my new laptop. In the first setup screen, I try to connect to my existing sbcglobal account using both the automatic (enter email address and password) and manual (entering pop3 settings). In either case, it does not accept a password I know is correct.
-->Symptoms
In Microsoft Outlook 2016 for Mac, you are repeatedly prompted for authentication while you're connected to your Office 365 account.
Microsoft Outlook 365 Mac Will Not Accept Password Manager
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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 Not Accepting Password
Note
Microsoft Outlook 365 Mac Will Not Accept Password Windows 10
These steps affect all Office applications that use modern authentication.
Outlook 365 Keeps Asking For Password
- 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.