Calculation previous month by category

Hello, everyone,

I need to calculate, on a table that has dates and values, and different categories for this values, where there is only one value for each permutation of dates and categroies, the value of of the previous month for the same categories as the month in question.

I have tried the following, which works for the month in question, but if you try to calculate the previous month, it does not work.

Increment / NCS = 
            CALCULATE(
                SUM('Table'[Value]), 
                PARALLELPERIOD('Table'[MonthYear], -0, MONTH)
            )

 This would be the one that does not work:

Increment / NCS = 
            CALCULATE(
                SUM('Table'[Value]), 
                PARALLELPERIOD('Table'[MonthYear], -1, MONTH)
            )

So I assumed I could try to filter by categories before applying the calculation, but I don't seem to be doing it correctly. This is what I have tried:

Increment / NCS = 
            CALCULATE(
                SUM('Table'[Value]), 
                PARALLELPERIOD('Table'[MonthYear], -0, MONTH),
                'Table'[Category1] = 'Table'[Category1],
                'Table'[Category2] = 'Table'[Category2],
                'Table'[Category3] = 'Table'[Category3]
            )

Thank you very much for your help!