Mail redirection address not added to source user object during DMA sync for Office 365 (4266451)

During DMA sync/matching, the source user object should be stamped with a secondary SMTP address correspinding with the target user GUID and the mail redirection domain that was configured in email redirection options.

In the DMA logs (QsDirectoryMigrationAgent.log), the following log lines can be seen:

4084 Starting mail redirection setup.
4084         Connecting to Microsoft Office 365 directory using account adminguy@domain.onmicrosoft.com . 
4084       Starting matching by ObjectId...
4084     Found object (type: User, ID: F590ADA2A28DA44D9D45634646JHG423, name: Test user).
4084 Object found. 
4084 Cannot redirect mail: Cannot perform the requested operation, because the RecipientType of the target object has an unexpected value: "User". Expected: "UserMailbox". .