'Function where user supplies a column name and a tbl

I had a function that previously worked where I iterated the same operations over a user input of column names that no longer works. Here's a very simplified scenario in which a user should be able to input a data.frame and a columname and the function should return an operation done on that particular column. This was working about 1 month ago.

df = data.frame(X1 = c(1:10), Y1=letters[1:10])
df

df %>% 
  mutate(X2=X1 * 2)


tb.test = function(tbl, column) {
  tbl2 = tbl %>%
    mutate(X2 = {{column}} * 2)
  return(tbl2)
}                                                                                   
tb.test(df, X1)

This no longer seems to be working with an error column X1 not found.

function tidyverse

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'Function where user supplies a column name and a tbl

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