Can I use VBA function to return a (dynamic) list of acceptable values into Excel's data validation?

Question

For a given cell, I select Data/Validation and set Allow to \"List\". I now wish to set Source like so:

=rNames(REGS)

but that does not work (name not found

Answer 1

Sounds like your rNames function is probably returning a 1-dimensional array (which will be treated as a row).
Try making your function return a column as a 1-based 2-dimensional array (Ansa(1,1) then Ansa(2,1) etc)