The problem it is inside the CountRows Function, this is not delegable
my recomedation it is store this filtered in a separeted collection, and after do this, you can use the CountRows function inside the collection, something like this:
ClearCollect(colTemp,Filter('MyDataSource', Year = ThisItem.LYear && MyPerson.Email = ThisItem.MyPerson.Email));
If(
CountRows(
colTemp
) > 1,
true
,false
)
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