To give you a brief insight into the error message, let us discuss what potentially causes it.

What causes the ‘No Mapping Between Account Names and Security ID was Done’ Error Message?

Well, the cause of the error is mentioned in the error message itself, however, to make more sense out of it, it is caused due to the following reasons: Now there are two possible explanations for this, either the account name used in GPO has a typing error or the account used in GPO has been removed from the Active Directory. There are multiple ways using which you can solve this error but the important thing is that you should resolve the issue which is causing it.

Finding the Culprit Account and Tweaking the Group Policy Settings

In order to resolve the issue, first, you will have to locate the account which is causing the issue. That can be only done if you have the log file enabled. To do that, you will have to edit the ExtensionDebugLevel entry in the Windows Registry which will enable the log file. Here’s how to do it:

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