Outlook iCloud Authentication Error Solved in 2 minutes

If two-factor authentication is enabled on your Apple ID, Outlook can’t use your standard Apple account password. So, you will have to generate a secure, one-time app-specific password. 

Outlook also stores old or expired login details. If your Apple password was updated or the authentication token has expired, Outlook may stop syncing your emails.

Check out these potential challenges that you may face when fixing the Outlook iCloud authentication error:

• Password change sync issues
• Conflicting data files
• Add-in disablement