Resolved - Unauthorized Error 401 During Office 365 Migration

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If you are thinking about a suitable cloud platform, then Office 365 is the favorite choice for the majority of business organizations. It has become dominant in the cloud business and most of the organizations are migrating their data at a fast speed. But, there are various precautions that you need to take care of while migrating the data, otherwise, there will be some unwanted errors.
In this technical guide, we will be discussing 401 Error code which does not even let the migration starts. The error is the following: “The request failed. The remote server returned an error: (401) Unauthorized.”

Reasons Behind Unauthorized Error 401 During Office 365 Migration

If you have encountered this type of error, then there may be multiple reasons behind this problem. Some of them are:

  • The user ID is different than the UPN (User Principal Name).
    Users might be facing this error if the Office 365 account which they are using is different from the UPN from the Active Directory.
  • Office 365-Active Multi-Factor Authentication (MFA) is Enabled.
    If MS Office 365 has multi-factor authentication enabled for the account, it becomes quite difficult for a manual method to access the mailbox easily.
  • The Username and Password have incorrect spelling.
    The spelling of the username and password of Office 365 is not correct.
  • The domain of Office 365 is not registered with the DNS of the Microsoft.
    Most of the time, the user creates an Office 365 account and try to start the migration instantly. The unauthorized error may encounter, because the domain of Office 365 may not be registered with the Microsoft DNS.

How to Fix 401 Error Code During Office 365 Migration

If you are facing this error, then you may try to use the following solutions to troubleshoot this problem:

  • Update the Administrator credentials.
  • After doing so, edit the Migration Endpoint in the Exchange Admin Center. Try to check the complete detail of the batch migration and edit the information.
  • Reset the password and the Administrator account.
  • Keep in mind to distribute the authorizations of the global administrator credentials to the Office 365 account.
  • You can select a different Office 365 account for the migration.

Alternate Solution to Fix 401 Unauthorized Error Code

After doing all the above-mentioned changes in the Office 365 account, the Unauthorized error 401 should be removed. Also, the migration should become smooth. But if you are still facing the same error due to UPN settings and there is no manual technique to solve the issue, then you must opt for a professional tool that can easily perform the migration on your terms. SysInfo Office 365 Migration is the best-suited migration utility that can access the email ID along with the UPN ID and performs the complete hassle-free migration.

Bottom Lines

The article is discussing the Unauthorized 401 Error code during Office 365 migration. All the best possible solution to resolve this issue have been discussed in detail. You must try the recommended Office 365 Migration tool, after using this utility you will not have to face errors like 401. Office 365 Migration software is a flexible tool that supports the Office 365 environment and reduces network complexities. I hope it helps you out to resolve your query.

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