Hi Patricia,
The pattern I would suggest for this is:
1) Download a file geodatabase of the feature service. Add the feature classes/tables to the enterprise geodatabase and publish as a feature service.
2) In Survey123 Connect, select the form, click on it's menu (3 bars in the lower right) and select 'Create a new survey'
3) In the form's XLS file, update the submission_url setting to the feature service in Enterprise
4) In Survey123 Connect, log in to the Enterprise deployment and publish the form.