Mailbox fails to reconnect during Intra-Forest Migration (4274757)

Mailbox fails to reconnect during Intra-Forest Migration

Attempts to manually reconnect the mailboxes using Exchange also fail with "error Object 'domain\username' could not be found. Please make sure it is spelled correctly or specify a different object."

The Connect-Mailbox cmdlet is failing to find the target account.

1. Copy the Exchange Management Shell Command from the failure. It will appear as:
connect-Mailbox -Identity <StoreMailboxIdParameter> -Database <DatabaseIdParameter> -User <UserIdParameter> -Alias <String>
2. Open the Exchange Management Shell
3. Past the command into the shell.
4. Append -DomainController 'DCNAME.Targetdomain.com' where 'DCNAME.Targetdomain.com' is the FQDN of a target domain controller

The final command should appear as :

connect-Mailbox -Identity <StoreMailboxIdParameter> -Database <DatabaseIdParameter> -User <UserIdParameter> -Alias <String> -DomainController 'DCNAME.Targetdomain.com'