Event ID - 292

Event Id292
DescriptionUnable to create Mailbox Username because the required Home-Server attribute was not specified.
Event InformationAccording to Microsoft:

This issue can occur because the import file needs the Home-Server column in the header to create a new mailbox. The default mode is update, which creates the object if it does not exist or modifies the object if it does exist.
To resolve this issue, add the Home-Server column to the Header.csv file.
Reference LinksEvent ID 292 When Performing a Directory Import

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