In the Feedback activity, there is the option "Anonymous" as well as "Allow multiple submissions".

It is stated that as soon as the feedback can be submitted anonymously, the participants of the course can submit the feedback as often as they like. (" If enabled for anonymous surveys, users can submit feedback an unlimited number of times.")

However, if "Allow multiple submissions" is set to "no", and "Record user names" to "Anonymous", then submitting multiple times does not work.

The "multiplesubmit_help" String is therefore misleading and should be changed. Or the plugin should lock the "Allow multiple submissions" setting to "Yes" in case of an "Anonymous" feedback.