Hello Andrea, I wanted to mention an issue we found with the Web Service Connector. Hopefully this will help you test to see if you have the issue too.
We have a webservice connection to a source to pull information into IdentityNow. We have it set up and working fine. The issue is that updated data in the source will not be updated in IdentityNow (after an aggregation). We are also unable to update the information using the download and upload csv from the UI. We have a Case open. I would encourage you to consider if the data you will be working with will need to be updated or refreshed. If so, you may want to open a case or consider another connector.