Grouping sickness absence

this is the code

let

    grp=(dates as list)=>
    let
    days=List.Count(dates)
    in List.Accumulate({1..days-1}, 1,(s,c)=>s+Number.From(Date.AddDays(dates{c-1},1)<>dates{c})),

    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Employee Number", Int64.Type}, {"ResID(T)", type text}, {"Date", type date}, {"Abs. code", type text}, {"Days", type number}},"en-US"),

    #"Grouped Rows" = Table.Group(#"Changed Type", {"Employee Number", "ResID(T)", "Abs. code"}, {{"Data", each grp(List.Difference(_[Date],holidays))}})
  
    in
    #"Grouped Rows"

this is the output table

this is the holiday table I used:

You have to create a reeal "holiday" table.

this is the input table, that I called "Source"

PS

If this is not what you expect or it is not working, in order to help you, you must provide more detailed information of what you have done and the code and data used.