Event ID - 292

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

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.
RESOLUTION :
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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