If the current tenant containing office 365 users is synchronized with on premise active directory , there is a possibility in duplication of on premise users with office 365 users in azure ad ?
In case scenario: if there is already user xyz@abc.com in azure ad directory , if it synchronized ,it takes on prem active directory user ie xyz@abc.local and register as xyz@abc.onmicrosoft.com will there be a duplication in users , as there will be two users after sync xyz@abc.com and xyz@abc.onmicrosoft.com?