When duplicating a service, the required alias field is blank, which seems like a bug or at least unintuitive behavior. The user asks if there are specific requirements for the alias (characters, numbers, length) since no instructions were visible.
Informed Evan that the behavior is expected—when duplicating a service, the alias field is left blank because each alias must be unique and cannot be auto-filled. To complete duplication, a unique alias must be manually entered. Alias requirements include: 4 to 40 characters long, lowercase letters only, cannot start or end with a dash or start with a number, and can only contain alphanumeric characters and dashes. Further detailed specs are available with an enterprise plan for API access.