Error: The domain of the given Source or Destination email doesn't match the domains configured for this project
When a customer creates a project with a Google connector (for either a Source or a Destination), he "owns" the domain in MigrationWiz. He also owns the domain when he does a user/distribution groups discovery on UserActivation.
When a customer owns a domain, it means he can use this domain for all his MigrationWiz/UserActivation projects, with no restrictions.
When a second customer tries to use this domain with a Google project (either in UserActivation or MigrationWiz), he will get an error and a link to a Knowledge Base article. The KB article should explain to him that another BitTitan customer already uses this domain in his project. He should contact BitTitan Support to unlock the domain for his account. The KB should explain how to contact BitTitan Support.