Remove Duplicates Per Group (keep first) measure help

Here's the M code that does what you want:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WKi1OLXJU0lEyBOLSvMzk/KI8ICstMTMHJGhgZWRsZWigFKuDUGkEks8vSi0uATIKEouLIQqNDaxMLFEU4jISVaUTTpXGViZA+40wVALliyqR7AaqM7YyBZoYCwA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [User = _t, EntryID = _t, Entry = _t, Status = _t, Time = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"User", type text}, {"EntryID", Int64.Type}, {"Entry", type text}, {"Status", type text}, {"Time", type time}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "FirstTimeEntry", 
        each List.Min( 
            Table.SelectRows(
                #"Changed Type",
                (r) => r[User] = [User] and r[Entry] = [Entry]
            )[Time] 
        ) = [Time]),
    #"Filtered Rows" = Table.SelectRows(#"Added Custom", each ([FirstTimeEntry] = true)),
    #"Removed Columns" = Table.RemoveColumns(#"Filtered Rows",{"FirstTimeEntry"})
in
    #"Removed Columns"

Best

D