User migrated to on-premise Exchange. A real Client IP address?

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Occasional Visitor

We have users migrated from Exchange Online to on-premise servers.

In the on-premise Exchange IIS log, I can see the Exchange Online IP address as client IP.

Company Audit logging is enabled from Compliance Center.

But there are no Audit log records for migrated users on the "Office 365 Compliance Center".

How can I get a "real" client IP address on the on-premise server?

 

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