Event ID - 291

Event Id291
SourceMSExchangeDSImp
Description"Description 1.
Unable to create Mailbox Username because the required Home-Server attribute was not specified.
Description 2.
Unable to process object <alias name> because the import line must contain the same number of fields as the header line.<number> were expected. <different number> were found."
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 LinksXADM: Event ID 292 When Performing a Directory Import

XADM: Error 291 with Exchange Bulk Import

XADM: Bulk Import/Export FAQ

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