Cannot use my AgentForce DE org to do the Create Advanced Agent Customizations Project

Hello    In the Service Agent Customization with Prompt Builder Project, the only thing I can do is either use the org I used for Prompt Builder Projects or create a basic sandbox with no AI capabilities available    I do have a DE org with Coral Service Agent created that is connected to my Trailhead but I cannot see it to pick it to do this module    The Service Agent Customization with Prompt Builder Project requires to update Coral Cloud Experience Agent which I can then not do    Thanks for your help