Simulation doesn't show the user account to update


we have configured the Active Directory sync. and we did the initial sync only one time to get the AD data in idm database. that worked.

now we are running the same(initial sync) workflow to sync the data, but we cannot see the users which was suppose to be there in the simulation report for update. 

i have also observed that, when i checked after an hr or 2, i can see the update ADSAccount numbers are increasing(but not the user which we were expecting). what could be the reason it is that slow?