Symptoms
When users try to use the eDiscovery & Hold function to search mailboxes that have online archives, the estimate gets completed. However, when users try to use the Copy Search Results function, the attempt fails and returns the following error message:
Note
Object reference not set to an instance of an object
This error affects users who have primary on-premises mailboxes and online archive mailboxes. Because of this error, users can’t export data for legal action.
Resolution
To fix this issue, install the following updates, as appropriate:
Cumulative Update 12 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019
Cumulative Update 23 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016