Hi @scherrie,
You could also have a look at this workaround which uses date-time stamp to auto generate a unique id for your survey form.
In the survey tab of your xlsform:
In the setting tab of your xlsform: Please note that this is optional (if and in-case you wish to name your survey submissions based on the unique id).
Data entry screen as seen in Enketo:
Reference xlsform:
Uniqe ID (Example).xls (23 KB)
Have a great day!
