Confidence Interval: getting "NA" as an answer. Why?

There is not help variable in this data but one in your formula.

Se also Best Practices: how to prepare your own data for use in a `reprex` if you can’t, or don’t know how to reproduce a problem with a built-in dataset?

You'll find some insight on how to provide data. However, what you did is ok. I was able to copy and use datapasta::tribble_paste to get a usable data for R.