When making a new library card registration, you may have encountered the message "Proxy Number Required" when you tried to save the record. This message appears if you accidentally click on a field in the Proxy Borr area of the registration form. There is a way to clear this message and save the record without having to start the registration from scratch.
Go to the Proxy Borr section of the form. Click the Delete button. This should clear any phantom characters in that section and allow you to save the record.
The same fix (click the Delete button) works if you encounter a similar problem in the Home Service area of the registration form.