Help with a Measure DAX

Good morning! I need your help with a DAX measure. 

My data model is composed of:

• A fact table called "assunta_datamodel_vehicles_calendar", it contains multiple VINs over several Month/Year rows because a vehicle's warranty can extend over multiple months. which contains the following columns:
1. active_days
2. activity_rate
3. n_days
4. VIN_CD (key that links the fact table to the DIM table cv_datamodel_usecase_vehicles)
5. year_month (key that links the fact table to the DIM table cv_datamodel_calendar.

• A dimension table cv_datamodel_calendar, containing the calendar, with the following columns:
1. DAY_DT (date format)
2. MONTH_NM
3. WEEK
4. YEAR_MONTH (linked with the fact table)
5. YEAR_NM
6. YEAR_WEEK_CD

• Another dimension table"cv_datamodel_usecase_vehicles" that filters the fact table and contains the vehicle information (VIN is the unique vehicle key), with the following fields:
1. VIN_CD (unique key linking to the fact table)
2. Brand_cd
3. Division_cd
4. Base_warranty_start_date

So, I need to filter the fact table by both calendar and vehicle dimension table. I need a DAX measure that calculates the sum of activity_rate, considering only the vehicles whose warranty date is between the MaxDate selected from the calendar and -24 months.
So far, I’ve written the first part for handling calendar dates by creating two variables:
 
TEST_DATE =
VAR MaxDate = MAX(cv_datamodel_calendar[DAY_DT])
VAR MinDate = EOMONTH(MaxDate, -24)
RETURN
 
Now, I need to add the SUM of activity_rate, filtered for the vehicles that have a Base_warranty_start_date between MaxDate and MinDate. Keep in mind that this column is of type text and formatted like this: 2023-03-14 (yyyy-mm-dd).
As a first step, I create a column in date format so I can filter correctly while keeping the yyyy-mm-dd order, and then I create the  DAX measure "

TEST11 =
VAR MaxDate = MAX(cv_datamodel_calendar[DAY_DT])
VAR MinDate = EOMONTH(MaxDate, -24)
RETURN
CALCULATE(
SUM(assunta_datamodel_vehicles_calendar[activity_rate]),
FILTER(
assunta_datamodel_vehicles_calendar,

RELATED(cv_datamodel_usecase_vehicles[DataFormattata]) >= MinDate &&
RELATED(cv_datamodel_usecase_vehicles[DataFormattata]) <= MaxDate &&

assunta_datamodel_vehicles_calendar[year_month] >= FORMAT(MinDate, "YYYY-MM") &&
assunta_datamodel_vehicles_calendar[year_month] <= FORMAT(MaxDate, "YYYY-MM")
)
)
"

but after several test the formula does not work correctly. Can someone help me understand?