When a feature service is created in Survey123 for ArcGIS using 'From Survey123 Web', and then exporting to File Geodatabase through Item Details returns 'Error exporting data to filegdb format'.
Option 1: Export the file geodatabase at the layer level from the Item Details for the feature layer only. Option 2: Download the file geodatabase through <a href="https://survey123.arcgis.com" target="_blank">https://survey123.arcgis.com</a> Data tab instead of the Item Details of the service.