Error
Some items have not been imported due to domain validation failure
Resolution
You may experience this error when importing PST into your project while it is configured to use G Suite as a Destination. This usually occur because MigrationWiz is enabled to discover the owner of the PST file, and will use a default email address which cannot be validated in the G Suite project.
A workaround is to change your Destination type to Office 365, import your items, then change the project type back to Google again.