Action: Directory sync: Install and run IdFix Before you set up directory synchronization, you'll want to run the IdFix DirSync ...

Action: Directory sync: Install and run IdFix Before you set up directory synchronization, you'll want to run the IdFix DirSync Error Remediation Tool. The tool scans your on-premises Active Directory environment and identifies problems that might impact directory synchronization and slow your migration to Office 365. Learn more at Install and run the Office 365 IdFix tool.