Office 365 won't log in without EnableADAL = 0

Office 365 won't log in without EnableADAL = 0

We've been experiencing an issue with our Outlook clients after a user is upgraded from Office 2016 Standalone to Office 365 Business: After the click-to-run installer is complete, and often after a reboot, Outlook will show the splash screen when launched, then a mini-browser window will be displaying showing the dreaded "An error occurred" message. We can click the "more details" link to see more info about the error, but it tells us nothing specific. Currently, our fix to this has been to add the following registry entry: 

HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity:"EnableADAL"=dword:00000000

Once the key is added, and the user restarts Outlook, they receive a legacy authentication dialog box, enter their domain password, and connect to their mailbox without issue. This seems to be our most effective fix, and it's the one we arrived at after hours of forum digging and web searches. Information and fixes from Microsoft have been scant as well, outside of the registry key one.

    • Related Articles

    • Planner Change of Ownership

      Go to Office 365 admin center > admin centers> Exchange In the Exchange admin center > Recipients > groups > select the plan group > edit > ownership to change the owner of the group, this will also change the owner of the plan.

    • How to Setup Office 365 on your Mobile Device

      Here is a nice link to show you how to setup your Office 365 Subscription on your Mobile Device https://support.office.com/en-us/article/Set-up-Office-apps-and-email-on-a-mobile-device-7dabb6cb-0046-40b6-81fe-767e0b1f014f

    • Force Exchange Online Archiving to start archiving email on Office 365

      When you enable Exchange Online Archiving for a user on Office 365, it can take 24 hours or more for the Managed Folder Assistant to start it’s first run and begin archiving email out of the primary mailbox. Edit: If you’re using the Exchange Online ...

    • Compress Outlook OST & PST File Size

      If you delete items from an Outlook Data File (.pst), the file is automatically compacted in the background when you’re not using your computer if Outlook is running. You can also manually start the compact process immediately. It might take several ...

    • Shared MailBox on MAC

      Adding a Shared Mailbox in Outlook for Mac Instructions for adding a shared mailbox to your account in Outlook for Mac with your Office 365 account 1. Open Outlook for Mac 2. Click ‘File’ 3. Hover over ‘Open’ then click ‘Shared Mailbox…’ 4. Type the ...