![]() Your email address differs from your user principal name (UPN).This issue occurs if the following conditions are true: However, you're repeatedly prompted for your credentials after you've already entered them. When you try to connect to the Exchange Online mailbox, your provider's Active Directory Federation Services (AD FS) authentication dialog box is displayed, and you enter your credentials. ![]() You're using Outlook 2016 for Mac version 15.20 or later versions to connect to an Exchange Online mailbox through a federated account, and modern authentication is enabled.
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