The {0} domain can't be reached. Because of this, the Domain Admins group for the domain won't be granted permissions to ...

The {0} domain can't be reached. Because of this, the Domain Admins group for the domain won't be granted permissions to run the PrepareDomain task. Domain administrators for the domain can be granted permissions to run the PrepareDomain task by adding the access control entry on the Exchange Servers group that grants them read and write access to the "member" attribute.