After installing Azure AD Connect, the below error shows when attempting to manually start a sync via Windows PowerShell.
Start-ADSyncSyncCycle : The term 'Start-ADSyncSyncCycle' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
Import the ADSync PowerShell Module.
Import-Module -Name "C:\Program Files\Microsoft\Azure AD Sync\ADSync" -Verbose
Verify that the module is now available.
Retry the sync via PowerShell
Start-ADSyncSyncCycle -PolicyType Delta