Do you have an issue with Office 365 not synchronizing with Outlook?

If so, you have come to the correct place!!

There could be many situations or scenarios in which you must synchronize Office 365 with Outlook. One of the explanations could be that you want to use the same interface with both accounts. This prevents you from having to switch over repeatedly.

Yet, the explanation could be that your Exchange admin activated multiple authentication methods for your Office 365 account but failed to enable advanced login.

In this situation, the system displays the error 'HTTP 456 authentication error'.

The screen shot following depicts a situation in which the user encounters a problem syncing Office 365 with their Outlook account.

How to Fix Office 365 Not Syncing with Outlook?

To resolve the aforesaid problem, the administrator can disable multiple-factor authentication and enable contemporary authentication.

The methods below will disable multi-factor authentication and enable contemporary authentication -

• Go to the Office 365 portal and log in with Admin credentials.
  
  
• From the Office 365 main page, select 'Admin'.
  
  
• Go to the navigation pane and pick 'Users', then 'Active Users'.
  
  
• In the 'Active Users' page, select 'More', then 'Multi-factor verification setup'.
  
  
• Select the impacted user's checkbox from the list of possible ones.
  
  
• Now, select 'Disable' to turn off authentication with multiple factors.
  
  
• Now, the administrator must enable ' modern verification'.

It should be noted that "trendy authentication" is enabled in the current versions of Office 365.

If the preceding technique fails, the best solution is to export the Office 365 data to a local machine and then import it into Outlook.

To learn how to transfer an Office 365 mailbox to PST locally, utilize an automated program like DataVare Office 365 Backup Tool.

The 'Office 365 Export' Tool has the following significant features:

• Export Microsoft 365 data to PST/EML/MSG files. 
• Uses 'Date & Category Filter' to extract data from certain date ranges and folders.
• Office Export restores read/unread emails after exporting. 
• Admin Impersonation can be used to export many user accounts at once. 
• Office Export is compatible with all Office 365 license levels.

 Works effectively on all the current versions of the Windows OS, including Windows 11.

Advantages of Using an Automated Tool -

• Easy to use, requiring only admin or user account credentials and a few steps to start the export process.
• Office 365 Export can be downloaded in any web browser, including Google Chrome, Internet Explorer, and Mozilla Firefox. As a result, any web browser can be used.
• Office 365 data can be obtained and kept in PST/MSG/EML formats for use in supporting applications. 
• The exported file is error-free. • No data is lost during the export process. 
• Email properties are preserved without compromising data integrity.

In the preceding lines, an automatic technique for exporting data locally was discussed.

• The next thing to do is import the exported Office 365 data into the Outlook account.
• The ones that follow are the steps for importing the exported data into your Outlook account:
• Before beginning an import, it is suggested that you disable Cached Exchange Mode.
• Navigate to the 'File' tab, select 'Open & Export', and then 'Import/Export'.
• Once completed, click on 'Import from another program or file' and then 'Next'.
• Select 'Outlook Data File (.PST)' as the file type from which to import.
• Navigate to the folder or file from which you wish to import data, and finally click 'Next'.
• Select the folder where you wish to import the data.
• Click the 'Finish' button.
• Once the import is complete, re-enable 'Cached Exchange Mode'.
  
  It is worth noting that Cached Exchange Mode saves a duplicate of your activities. To avoid slowing down internet connectivity, it is best to disable it.
  In the preceding lines, you can effectively import Office 365 data into your Outlook account. Such a strategy is useful when all other methods fail to sync Office 365 with the Outlook account.

In this blog, you will learn about the possibilities and implications for resolving the issue 'Office 365 not synchronizing with Outlook'. The attempt was performed manually, and if it fails, the reliable automatic tool 'Office 365 Export' and the import procedure via the Outlook account can be utilized to resolve the issue. As a result, you can choose the approach that best meets your needs from the options listed above.