Object reference not set to an instance of an object error and message trace fails in an Exchange hybrid environment
Original KB number: 4481099
Symptoms
Considering this scenario:
- You're working in a Microsoft Exchange Server hybrid environment.
- A message is sent from an on-premises mailbox to an Exchange Online mailbox.
- You try to trace the message in Delivery Reports in the on-premises Exchange organization.
In this scenario, the trace fails, and you receive this error message:
Object reference not set to an instance of an object.
Cause
This is by design. Exchange Server does not support tracing a message that's sent from on-premises to the cloud in a hybrid environment.
Workaround
To work around this problem, run the message trace from Microsoft 365 to get a partial trace on the cloud side. Be aware that this does not show the on-premises path.
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