There are an essence for sweep attack that don’t stack or useable with any other essence despite it should 
, as we used to understand if the essence description says something like " now also " 
that means that essence can be used with another one for the same skill and we have many examples about that in the game, How ever the essence " Clean sweep " doesn’t for some reason 
, so either change that and make it useable or change the text ,thanks !
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So the trick.
So when you look at your item in your inventory
If the skill description starts with a white title that is a primary skill. You can’t stack skills with the same title.
Secondary or stackable skills will have no title at the beginning of the description.
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I know that my friend but I am talking here about the essences it self , after you extract the essence you going to notice that despite the essence for the " cleans sweep " says now also " witch is a huge difference in diablo immortal than saying "now " … All the essences in the game say now also it means it can work with other essence for the same skill except this one in the entire game
We recently got this fixed for an old Barb essence. What slot is this and is it an older essence? What essences are you trying to combine?
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It’s an old essence for the main hand crusader called " clean sweep " as per diablo rules it should work since it got "also " in the description as explained but it doesn’t work with any other essence like " remonstrant mace " or any other essence for the sweep attack in general
This is an assumption not than a rule. We all assumed this but if it has a white title then it is not the case.
I’ll see if I can poke the dev about this one
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I meant to say like as we used to ..
Ty so much buddy U r the best 
this has been updated.
That was really fast ! Very impressive work , thanks alot for the help really appreciated