You don't have any duplicates - a duplicate is defined as the same value in every column of the row.
If you want to remove individual cells that are duplicated, then you could copy the entirety of column Two below column One, and then use remove duplicates based on that single column. You could move the Two Values back into column B when you are done.
If you were to remove duplicates from the entire table based on just column A, you would be left with one row of data.