Download/Install Outlook 2016 for Mac. Note: If you already have Outlook 2016 for Mac installed on your computer, skip this section follow the steps below to configure the client. Log in to Outlook on the web. Click on settings gear icon,. Click Office 365 Settings. Within 'Settings' section, click Software. Click Install. When trying to send an email from Outlook 2016 (Mac) I get this error: 'Authentication failed because Outlook doesn't support any of the.
By Tobias Lekman, 15 June, 2016 When logging into Exchange or Office 365 using Outlook 2016 for Mac. You receive the error “ Authentication failed. Check your account information and try again” or the client simply stops syncing. I looked around various forums without any response but found that the cause for me was due to invalid KeyChain entries. You need to fix the KeyChain on your Mac by trying one of the following: Test 1: Reset your iCloud Keychain password If you are syncing Keychain Access to iCloud then try resetting the iCloud key by. Opening iCloud under the System Preferences pane. Click Options under Keychain.
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Click Change Security Code and follow the instructions Test 2: Reset default keychain If this should not work then you may need to reset your Keychain. Start the app Keychain Access. Open Preferences and select Reset My Default Keychain.