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1. UNABLE TO AUTHENTICATE OUTLOOK 2016 ON MAC HOW TO
2. UNABLE TO AUTHENTICATE OUTLOOK 2016 ON MAC PASSWORD
3. UNABLE TO AUTHENTICATE OUTLOOK 2016 ON MAC OFFLINE

For information about how to configure a connection to a proxy server, see Mac OS Help. Cause: Your computer requires a mail proxy server to connect to the Exchange server. Under Microsoft Exchange and Directory service, select the Use SSL to connect check boxes. Click Advanced, and then click the Server tab. Solution: Contact your Microsoft Exchange account administrator.Īsk your Exchange account administrator which proxy server you should use to connect to the Exchange server. In the left pane of the Accounts dialog box, select the account. The issue is caused by a requirement for ‘Modern Authentication’ to be enforced. Unable to add account to Outlook version 15.xx or 16.xx, from two different Mac devices and builds, including latest version of High Sierra - Keychain has been reset Everything seems to point to an authentication\identification problem with the users account against the 365 servers.

UNABLE TO AUTHENTICATE OUTLOOK 2016 ON MAC PASSWORD

Under Microsoft Exchange and Directory service, select the Use SSL to connect check boxes.Ĭause: Your computer requires a mail proxy server to connect to the Exchange server. I recently had a major issue where a client was seeing constant password prompts when multi-factor authentication (MFA) was enabled for access to Office 365 with his Outlook 2016 client. In the left pane of the Accounts dialog box, select the account.Ĭlick Advanced, and then click the Server tab. If this is the case, verify the setting for this channel. Solution: Contact your Exchange server administrator to learn if your account requires an encrypted channel. Cause: Your Exchange account requires you to log on by using an encrypted channel.

You can also check the status of the Exchange server by contacting your Exchange server administrator. If you've successfully connected to the account before, try to connect to it from another Exchange application, such as Outlook on the web. If there is a problem with the connection, the indicator icon will be orange. Look at the Exchange account in the left pane. Solution: Check your Microsoft Exchange server connection. Cause: The server running Microsoft Exchange Server is unavailable. If you connect to your Exchange account over the web, use a browser to see if you can access web sites. You can also ask a colleague who uses similar settings if he or she can connect to the network. Solution: Make sure your computer is connected to the network.įor instructions on checking the status of your network connections, see Mac OS Help, or contact your Exchange server administrator or your network administrator. Cause: Your network connection is unavailable.

UNABLE TO AUTHENTICATE OUTLOOK 2016 ON MAC OFFLINE

If it is, click Work Offline to remove the check mark and work online.

On the Outlook menu, make sure that Work Offline is not checked. Tip: To verify that you are using the correct credentials, try to connect to your account from another Exchange application, such as Outlook on the web.