Merge/Combine Multiple Rows Records to Single Column Record with Comma delimiters in SQL

Table Name: ElMsisdnString

RetailerId ElMsisdnNo (varchar)
1 123
1 456
SELECT RetailerId, 
       STUFF ((SELECT ', ' + A.ElMsisdnNo
               FROM dbo.ElMsisdnString A
               WHERE     A.RetailerId = B.RetailerId FOR XML PATH('')), 1, 1, '') AS MSISDNS
FROM dbo.ElMsisdnString B
GROUP BY RetailerId

Query Result:

RetailerId ElMsisdnNo
1 123, 456
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