Lost Clients PBI - powerbi-desktop

Question

I am trying to get the number of lost clients per month. The code I'm using for the measure is set forth next:
`LostClientsRunningTotal =
VAR currdate = MAX('Date'[Date])
VAR turnoverinperiod=[Turnover]
VAR clients=
ADDCOLUMNS(
Client,
"Turnover Until Now",
CALCULATE([Turnover],
DATESINPERIOD(
'Date'[Date],
currdate,
-1,
MONTH)),
"Running Total Turnover",
[RunningTotalTurnover]
)
VAR lostclients=
FILTER(clients,
[Running Total Turnover]>0 &&
[Turnover Until Now]=0)
RETURN
IF(turnoverinperiod>0,
COUNTROWS(lostclients))`
The problem is that I'm getting the running total and the result it returns is the following:
enter image description here
What I need is the lost clients per month so I tried to use the dateadd function to get the lost clients of the previous month and then subtract the current.
The desired result would be, for Nov-22 for instance, 629 (December running total) - 544 (November running total) = 85.
For some reason the **dateadd **function is not returning the desired result and I can't make head or tails of it.
Can you tell me how should I approach this issue please? Thank you in advance.