Error
Tables without a clustered index are not supported in this version of SQL Server.
Cause
Some versions of Azure SQL require every table to have a Clustered Index, if you are using this kind of version, you might encounter this issue.
Resolution
You can run the following command to create an Index. Set the <tablename> to the same name you have entered in your MigrationWiz project.
CREATE CLUSTERED INDEX idx_auditlog on <tablename> ( MailboxId, EventTimestamp );
GO
This will create the necessary Clustered Index and allow MigrationWiz to insert data into the table.