1. Make sure the bot is online. Discord may be having problems, or they bot may need to be restarted.(for more information you can check our Discord)
2. Make sure you are using the right prefix. The default prefix is set to !
3. If none of the above work feel free to join our Discord and ask for help.
The bot can only assign roles that are below it, double check where the bot role is on the list and where the role you are assigning is.