Spaces are not supported in the name column and should be avoided, but spaces can be used in the label column which is what will be displayed in the survey form to the end user. The value in the name column is what will be stored in the feature service. Hope this helps.
Hi Philip and thank you very much !
My bad !
I thought I had to write exactly the same things in label and name column,
Thank you again for your very kind answer it helped a lot !
Have a good day !