T-SQL - Multiple WITH clause and then SUM total - sql-server

Question

I am using T-SQL and aim to use three WITH clauses to collect into my main table query. If I run each WITH query by themselves, I can get the desired results. But when blending it into my main table query, no results show. I reckon my WITH clauses are okay but have played around with my main table query with no desired outcome.
Any help is much appreicated.
WITH n1 AS (SELECT m.name AS n1nom, SUM(y.Column1) AS SomeTotal1
FROM Mees m
INNER JOIN Listy y
ON y.m1=m.name
WHERE Yr=2020
GROUP BY m.name)
,
n2 AS (SELECT m.name AS n2nom, SUM(y.Column1) AS SomeTotal2
FROM Mees m
INNER JOIN Listy y
ON y.m2=m.name
WHERE Yr=2020
GROUP BY m.name)
,
n3 AS (SELECT m.name AS n3nom, SUM(y.Column1) AS SomeTotal3
FROM Mees m
INNER JOIN Listy y
ON y.m3=m.name
WHERE Yr=2020
GROUP BY m.name)
SELECT m.name, SUM(n1.sometotal1 + n2.sometotal2 + n3.sometotal3) AS Cool
FROM Mees M
INNER JOIN n1
ON n1.n1nom=m.name
INNER JOIN n2
ON n2.n2nom=m.name
INNER JOIN n3
ON n3.n3nom=m.name
GROUP BY m.name, n1.sometotal1 + n2.sometotal2 + n3.sometotal3;

Answer 1

If you want the total of y.Column1 when m.name matches any of y.m1, y.m2 and y.m3 then you need only 1 join and aggregation:
SELECT m.name, SUM(y.Column1) AS Total
FROM Mees m
INNER JOIN Listy y
ON m.name IN (y.m1, y.m2, y.m3)
WHERE Yr = 2020
GROUP BY m.name
If you want to add y.Column1 multiple times in case more than 1 of y.m1, y.m2 and y.m3 match m.name then use a CASE expression inside SUM():
SELECT m.name,
SUM(
(
CASE WHEN m.name = y.m1 THEN 1 ELSE 0 END +
CASE WHEN m.name = y.m2 THEN 1 ELSE 0 END +
CASE WHEN m.name = y.m3 THEN 1 ELSE 0 END
) * y.Column1
) AS Total
FROM Mees m
INNER JOIN Listy y
ON m.name IN (y.m1, y.m2, y.m3)
WHERE Yr = 2020
GROUP BY m.name