PowerBi - Left Outer Join

[Akanksha1928]

I want to do Left Outer Join between 2 table,
There are some common values in Key column instead it is showing selection matches 0 of 4 rows.

[ronrsnfld]

Your screenshots don't show any matches. Don't forget, with Table.Join or Table.NestedJoin the matches have to be exact (including case). But without seeing what you think should have matched, it is not possible to advise further.

[amustafa]

Since it's a text column, I would do some Data transformations on column KEY in both tables like trim, clean, lowercase then do the join.