The function is `iif()` with two i and one f, not `iff()` with one i and two f. If you search for the correct name in the changes list you will see it was added in 3.32.0, so your 3.30.1 is too old even with the correct spelling.
The function is `iif()` with two i and one f, not `iff()` with one i and two f. If you search for the correct name in the changes list you will see it was added in 3.32.0, so your 3.30.1 is too old even with the correct spelling.