How would the "New option org-id-ts-format" work?

I added to my init.el these lines with no result (sorry if I am 
commiting heresy):

(defcustom org-id-ts-format "%Y-%m-%d-T%H-%M-%S.%6N"
   "Timestamp format for IDs generated using `ts' `org-id-method'.
The format should be suitable to pass as an argument to 
`format-time-string'.
Defaults to ISO8601 timestamps without separators and without
timezone, local time and precision down to 1e-6 seconds."
   :type 'string
   :package-version '(Org . "9.5"))

The format still is ISO8601 with no separators.