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Symptoms 

When you migrate users to Exchange Online, an E-Discovery search fails and returns the following error message:

Deserialization of type Microsoft.Exchange.Data.Directory.ADMultiValuedProperty`1 blocked due to NotInAllow at location MailboxDataStore. 

Cause 

This error occurs because E-Discovery search requirements block the mailboxes from being migrated.

Resolution 

To fix this issue, install the following cumulative update, as appropriate:

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