Configure Device User Code Settings
You can configure settings for the user code generated by your application during the Device Authorization Flow using the Auth0 Dashboard.
Go to Dashboard > Settings and click the Advanced tab.
Scroll to the Device Flow User Code Format section, locate User Code Character Set and User Code Mask, enter the desired settings, and click Save.
Setting Description Device Flow User Code Format Character set used to when randomly generating a user code. User Code Mask Mask used to define length and format of a randomly-generated user code. Its purpose is to increase the user code's readability and ease of input.