365 Azure AD Connect Sync Resolve Duplicate Names

Scenario

When setting up 365 and Azure, 365 accounts were created manually, such as admin accounts. Later, Azure AD Connect to setup. Once synced, duplicate accounts will be created.

Steps to resolve

• Remove License
• Delete 365 manually created account
• Delete Account with Powershell
  • (e.g. Remove-MsolUser -UserPrincipalName jsilvers6696@collegiatehousingservices1.onmicrosoft.com
• Wait until next sync happens or manually force a sync
  • Start-ADSyncSyncCycle -PolicyType Delta
• *** Wait ***
• Re-license recreated account