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Need to convert DB2 query to TSQL
WITH Selected_Users(id) as (VALUES (@id1), (@id2), --etc--),
     Threads(id) as (SELECT DISTINCT threadFk
                     FROM ThreadMembers as a
                     JOIN Selected_Users as b
                     ON b.id = a.userFk)
SELECT a.id
FROM Threads as a
WHERE NOT EXISTS (SELECT '1'
                  FROM ThreadMembers as b
                  LEFT JOIN Selected_Users as c
                  ON c.id = b.userFk
                  WHERE c.id IS NULL
                  AND b.threadFk = a.id)
AND NOT EXISTS (SELECT '1'
                FROM Selected_Users as b
                LEFT JOIN ThreadMembers as c
                ON c.userFk = b.id
                AND c.threadFk = a.id
                WHERE c.userFk IS NULL)

WITH Selected_Users(id) AS (
     SELECT Id FROM (
        VALUES (@id1), (@id2), --etc--
     ) AS V(Id)
),
....

DECLARE @selected_Users TABLE (id int);
INSERT @selected_Users VALUES
 (@id1),
 (@id2),
 --etc.--
 ; --make sure to close with semi-colon before WITH CTE

WITH Selected_Users(id) AS (
    SELECT * FROM @selected_Users
),
....

WITH Selected_Users(id) AS (
   SELECT @id1
   UNION ALL SELECT @id2
   UNION ALL SELECT @id3
   --etc.--
),
....

WITH Selected_Users(id) AS
(
    SELECT @id1 UNION
    SELECT @id2
),
Threads(id) AS
(
    SELECT DISTINCT
        threadFk
    FROM
        ThreadMembers a
    JOIN
        Selected_Users b
        ON
        a.userFk = b.id
 )
 SELECT
     a.Id
 FROM
     Threads a
 WHERE
 ...