Hey there @isaacj286,
Just to make sure are you attempting to create the Ad Account through our UI or in Facebook?
Our system pulls up any Ad Accounts associated with your administered business Facebook pages automatically, but we don't have a way to create them on our end. I'd recommend using Facebook's article on the subject for guidance.
Once you've created the Ad Account to associate with your business page(s), our system will detect that information from the business page you chose for your lead ad.