SharePoint Web Services Issue

The fact that the error message mentions the GetUserMemberships web service specifically suggests that the problem may be related to the user's profile information. However, since you have already confirmed that the user's account exists in the User Profile Service, it is also possible that the problem is with the web services themselves.

Here are a few things you can try to troubleshoot the problem:

1. Check the SharePoint server logs for more information about the error. The log ID and correlation ID mentioned in the error message can help you to locate the relevant log entries.
2. Try restarting the SharePoint server.
3. Make sure that the InfoPath form is configured to use the correct web service URL.
4. Try using a different web browser to access the InfoPath form.
5. Make sure that the InfoPath form is using the correct authentication method. By default, InfoPath uses Windows Integrated Authentication. However, if the SharePoint site is configured to use a different authentication method, you will need to configure the InfoPath form accordingly.
6. Make sure that the user who is trying to access the InfoPath form has the necessary permissions to use the SharePoint web services.

Here is a useful link you can use:
SharePoint 2013 - Creating folders from within an InfoPath form using DWS services (microsoft.com)