Unfortunately, RFID scanners only make confirmation tones to indicate that the code has been scanned, and do not indicate whether or not a code has been successfully transferred to the camera.
To verify that the code has indeed been sent to your camera, we recommend setting up a smartphone or tablet with the Entagged app on a tripod as part of your shoot gear. You can then keep an eye on the Entagged app and see that your codes are being captured correctly.
For more information, please check out this article: Entagged with RFID/NFC Scanning Photo Job Workflow