No Special Characters or Symbol for Username in Ingress Allowed
Username is the short name being displayed on a device’s LCD after the device verified an employee successfully and the username will not appear on any slave readers that do not have any LCD.
However, do not take the Username matter lightly when you are using Ingressus controller. DO NOT apply any special characters or symbol to this Username column. Any characters or symbols will cause Ingress software fail to upload employee credentials to Ingressus.
Hence, stick to alphanumeric only when it comes to Username.