Office 365 supports the upload of PST files to Azure storage for a direct import to mailboxes hosted in Exchange Online. The steps are described in detail in the online documentation at Microsoft Docs.
Import CSV using an email address
But you might encounter the following error after starting the import job using the Security & Compliance dashboard.
X-Psws-Exception: Microsoft.Exchange.Configuration.Tasks.ManagementObjectAmbiguousException,The operation couldn't be performed because 'TeamMailbox-Sales@varunagroup.de' matches multiple entries.
X-Psws-Warning: When an item can't be read from the source database or it can't be written to the destination database, it will be considered corrupted. By specifying a non-zero BadItemLimit, you are requesting Exchange not copy such items to the destination mailbox. At move completion, these corrupted items will not be available at the destination mailbox.
Before you were able to start the import job the job configuration, the CSV file, and the content of the PST file were analyzed successfully. There was no hint of multiple entries for the target mailbox.
The detailed error message can be retrieved using the View log link. A clear text message is stated in the Status detail column, but you need to expand the width of the column.
The hint provided in the status detail column states that there are multiple identities for the primary email. At this point in time, I do not know, how this possible when the target account is synchronized with AAD Connect.
Use the target mailbox GUID instead of the target email address as the target address in the CSV configuration file.
Connect to Exchange Online Remote PowerShell session and query the mailbox GUID for the target mailbox(es).
# Query target mailbox GUID for a single mailbox
Get-Mailbox TeamMailbox-Sales@varunagroup.de] | FL Guid
Create a new import job referencing the same PST file already copied to the Azure storage.
Import CSV example using the mailbox GUID
The import job will now be executed as expected.
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