Concat on Pivot Table doesn't work

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Hi experts, 

I have this data:

Type of Breach	Type	Count	Month
BreachA	Red	1	Feb-19
BreachA	Red	1	Mar-19
BreachA	Red	1	Mar-19
BreachA	Red	1	Mar-19
BreachA	Amber	1	Mar-19

I would like to display this in pivot table with set expression/analysis  as shown below:

Type of Breach	Feb-19	Mar-19
BreachA	Red-1	Amber-1, Red-3

I tried this expression but it doesn't work for some reason:

Concat(Aggr(DISTINCT MaxString(Type) & Count(Count), Type), ', ')

Currently it shows me this:

Type of Breach	Feb-19	Mar-19
BreachA	Red1	Amber1

Appreciate any help that I can get. Type in example instead of sharing Qlikview files as I can't open it. Thank you.

[NZFei · Accepted solution]

Concat(aggr(Type & '-' & sum(Count), [Type of Breach], Month, Type), ', ')